CN109762592B - Combined dephenolization washing process and system combining opposite spraying type and front-pump mixing type - Google Patents
Combined dephenolization washing process and system combining opposite spraying type and front-pump mixing type Download PDFInfo
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Abstract
The invention relates to a combined dephenolization washing process and a combined dephenolization washing system combining a spray type and a pre-pump type, wherein the combined dephenolization washing process comprises at least one spray type dephenolization washing process and at least one pre-pump type mixed dephenolization washing process, and the separation of products is completed by adopting the spray type dephenolization washing process. The invention develops a combined washing process by utilizing the characteristics of good oil-water separation effect of the opposite spray type washing process and high reaction efficiency of the pre-pump mixed type washing process, and has the advantages of high reaction efficiency and good oil-water separation effect.
Description
Technical Field
The invention relates to the technical field of distillate dephenolization washing, in particular to a combined dephenolization washing process and system combining opposite spray type and pump front mixing type.
Background
In the metallurgical coking industry, the dephenolizing and washing of the fraction is a process of extracting phenol from the non-washed mixed parts of phenol oil, naphthalene oil or phenol naphthalene which are distilled and cut by using a 12% NaOH solution, for example, after the non-washed mixed parts are mixed with the 12% NaOH solution, phenol in the non-washed mixed parts can react with alkali to generate sodium phenolate dissolved in water, and the phenol sodium phenolate can be subjected to oil-water separation with the dephenolized mixed parts through standing treatment.
The process of the pre-pump mixed dephenolization washing technology comprises the following steps: mixing unwashed mixed parts and dilute alkali before a mixed part conveying pump, stirring by the pump, fully reacting phenol in unwashed mixed parts with alkali to obtain a phenol sodium salt and dephenolized mixed parts, then entering a continuous washing separation tower for standing oil-water separation of the phenol sodium salt and dephenolized mixed parts, obtaining a dephenolized washed product phenol sodium salt at the bottom and a washed mixed part at the top, wherein the washing process can reach washing standards generally after twice washing.
The mixing process before the pump is characterized by simple process, good mixing effect of alkali and unwashed mixed parts, complete reaction, and the defect of poor separation effect of the continuous washing separation tower, and the reasons are as follows:
the continuous washing separation tower adopts a cylindrical vertical empty tower, unwashed mixed parts and dilute alkali solution are mixed before a mixed part conveying pump, the mixed parts enter from the middle part of the continuous washing separation tower after being stirred by the pump, the obtained phenol sodium salt solution and dephenolized mixed parts are subjected to standing oil-water separation, the dephenolized mixed parts are fully discharged from the top, the phenol sodium salt aqueous solution is discharged from the bottom, the flow-out quantity of phenol sodium salt is regulated by regulating the full flow height of a phenol sodium salt outlet pipeline through a liquid level regulator, the flow-out quantity of the phenol sodium salt is close to the actual generated quantity, the quantity of the full flow dephenolized mixed parts is close to the normal generated quantity, the separation interface of the oil water is unchanged at a preset position, and only then, the whole continuous washing separation tower is operated normally, so that the separation interface of the oil water is kept constant.
In the practical process, according to the prior design, the oil-water separation interface cannot be found at all or does not exist at all, because unwashed mixed parts and dilute alkali solution are mixed before a mixed part conveying pump, and after the mixed parts enter the middle part of a continuous washing separation tower after being stirred by the pump, a turbulent layer with a certain height is formed in the middle part of the continuous washing separation tower due to the fact that mixed fractions have a certain kinetic energy, the turbulent layer has an emulsifying phenomenon, namely an emulsifying layer, oil-water is difficult to stand down for separation, and meanwhile, the upper liquid column and the lower liquid column are influenced. The oil-water separation can not meet the separation requirement, has no clear oil-water separation interface and no relative standard operation index, and can influence the oil-water separation effect of the continuous washing separation tower when the phenol content of unwashed mixed parts of raw materials or the addition amount of the high-level tank dilute alkali solution fluctuates.
The process of the opposite spray type dephenolizing and washing is as follows: the unwashed mixed parts and the dilute alkali are respectively pumped into a washing tower, the unwashed mixed parts enter a distribution plate at the lower part of the washing tower to be sprayed upwards, the dilute alkali enters a distribution plate at the upper part of the washing tower to be sprayed downwards, the unwashed mixed parts are in countercurrent contact with the dilute alkali in the tower, phenol in the unwashed mixed parts can react with the alkali to obtain phenol sodium salt and dephenolized mixed parts, the phenol sodium salt flows out from the bottom of a clear liquid column below the distribution plate at the lower part of the tower through a liquid sealing pipeline, and the dephenolized mixed parts flow out from the top of a clear liquid column above the distribution plate at the upper part of the tower.
The spray washing process has the characteristics of simple flow, good separation effect of the mixed parts of the sodium phenolate and the dephenolization, and the disadvantage that the reaction efficiency is not high in the pre-pump mixed washing process, and is generally used for the fraction with low phenol content due to the following reasons:
the washing tower of the spray-type washing process adopts a cylindrical vertical tower, and is provided with two liquid spraying distribution plates, wherein the upper part is provided with a distribution plate for spraying alkaline liquid downwards, the lower part is provided with a distribution plate for spraying mixed parts upwards, the liquid is contacted and reacted by convection to generate phenol sodium salt and dephenolized mixed parts, an oil-water separation interface is arranged between the two distribution plates, namely, the upper part is provided with a dephenolized mixed part liquid column, the alkaline liquid is sprayed downwards to form a disperse phase, the dephenolized mixed parts are continuous phases, and the lower part is provided with a phenol sodium salt liquid column; the unwashed mixed parts are sprayed upwards to form a disperse phase, and the sodium phenolate aqueous solution is a continuous phase; the mixing reaction is performed with very good extraction effect and still standing separation effect, so the oil-water separation effect is very good, but the washing effect is poorer than that of the mixing before the pump due to insufficient oil-water mixing.
Disclosure of Invention
The invention provides a combined dephenolization washing process and a combined dephenolization washing system combining a spray type washing process and a pre-pump mixing type washing process, which develop a combined washing process by utilizing the characteristics of good oil-water separation effect of the spray type washing process and high reaction efficiency of the pre-pump mixing type washing process and have the advantages of high reaction efficiency and good oil-water separation effect.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the combined dephenolizing washing process with mixed combination of spray type and pump-front type has at least one spray type dephenolizing washing process and at least one pump-front mixed dephenolizing washing process, and the separation of the product is completed through spray type dephenolizing washing process.
A combined dephenolization washing process combining a spray type and a pre-pump hybrid type, comprising the following steps:
1) The unwashed mixed parts and the secondary alkaline sodium phenolate are respectively pumped into a No. 1 extraction and washing tower for primary washing, the unwashed mixed parts enter a distribution plate at the lower part of the No. 1 extraction and washing tower for upward spraying, the secondary alkaline sodium phenolate enters a distribution plate at the upper part of the No. 1 extraction and washing tower for downward spraying, the unwashed mixed parts and the secondary alkaline sodium phenolate are in countercurrent contact in the No. 1 extraction and washing tower, the residual alkali components of the secondary alkaline sodium phenolate are neutralized by phenol in the unwashed mixed parts, and a small amount of mixed parts carried by the alkaline sodium phenolate are extracted to obtain neutral sodium phenolate; the neutral sodium phenolate aqueous solution of the product obtained after the neutral sodium phenolate stays for a period of time is fully flowed to the buffer tank at the bottom in a full-flow mode through the interface regulator, and then is pumped out by the neutral sodium phenolate; in the process, the unwashed mixed parts undergo one-time washing to obtain one-time dephenolized mixed parts;
2) Mixing the primary dephenolization mixed part with excessive primary alkaline sodium phenolate before a secondary continuous washing pump for secondary washing after the primary dephenolization mixed part passes through a primary dephenolization buffer tank, stirring by the secondary continuous washing pump, fully reacting phenol in the primary dephenolization mixed part with alkali in the excessive primary alkaline sodium phenolate, enabling the obtained secondary alkaline sodium phenolate and the secondary dephenolization mixed part to enter a tower from the middle part of a continuous washing separation tower, carrying out standing oil-water separation of the alkaline sodium phenolate and the dephenolization mixed part, obtaining secondary alkaline sodium phenolate after dephenolization washing at the tower bottom, and obtaining secondary dephenolization mixed part after washing at the tower top;
3) The secondary dephenolization mixed part is sent into a distribution plate at the lower part of a No. 2 extraction washing tower by a tertiary continuous washing pump to be sprayed upwards, dilute alkali enters the distribution plate at the upper part of the No. 2 extraction washing tower to be sprayed downwards, the washed secondary dephenolization mixed part is contacted with dilute alkali in a countercurrent manner in the tower, the dilute alkali neutralizes residual phenol in the washed secondary dephenolization mixed part, and a small amount of alkaline sodium phenolate carried in the washed secondary dephenolization mixed part is extracted to obtain washed mixed part; after the washed mixed parts stay for a period of time, the washed mixed parts of the product are obtained; in the process, the diluted alkali is washed to obtain primary alkaline sodium phenolate, the mixed diluted alkali solution is primary alkaline sodium phenolate, and the primary alkaline sodium phenolate is fully flowed into a buffer tank at the lower part in a full-flow mode through an interface regulator, and is pumped to be washed for the second time by the primary alkaline sodium phenolate.
The combined dephenolization washing system for realizing the process comprises a No. 1 extraction washing tower, a secondary alkaline sodium phenolate tank, a continuous washing separation tower and a No. 2 extraction washing tower; the upper part and the lower part of the No. 1 extraction washing tower are respectively provided with a distribution disc, the distribution disc at the lower part is provided with an unwashed mixed part inlet, the distribution disc at the upper part is provided with a secondary alkaline sodium phenolate inlet and is connected with a secondary alkaline sodium phenolate tank through an inlet pipeline, and the inlet pipeline is provided with a secondary alkaline sodium phenolate pump; the distribution plate at the upper part of the No. 1 extraction washing tower is provided with a plurality of lower nozzles, and the distribution plate at the lower part is provided with a plurality of upper nozzles; the bottom of the No. 1 extraction washing tower is provided with a product neutral sodium phenolate outlet; the top of the No. 1 extraction washing tower is provided with a primary dephenolization mixture outlet, a primary dephenolization mixture inlet in the middle of the washing separation tower is connected through a pipeline, and a primary dephenolization buffer tank, a primary alkaline sodium phenolate inlet and a secondary continuous washing pump are sequentially arranged on the pipeline along the material conveying direction; the bottom of the continuous washing separation tower is provided with a washed secondary alkaline sodium phenolate outlet, the secondary alkaline sodium phenolate tank is connected through a pipeline, and an interface regulator is arranged on the pipeline; the upper part of the continuous washing separation tower is provided with a secondary dephenolization mixed part outlet, the secondary dephenolization mixed part outlet is connected with a secondary dephenolization mixed part inlet of a lower distribution plate of the No. 2 extraction washing tower through a pipeline, the pipeline is sequentially provided with a secondary dephenolization buffer tank and a tertiary continuous washing pump along the material conveying direction, the distribution plate at the upper part of the No. 2 extraction washing tower is provided with a dilute alkali inlet, the distribution plate at the upper part of the No. 2 extraction washing tower is provided with a plurality of lower nozzles, and the distribution plate at the lower part is provided with a plurality of upper nozzles; the top of the No. 2 extraction and washing tower is provided with a washed mixed part outlet, the bottom of the No. 2 extraction and washing tower is provided with a primary alkaline sodium phenolate outlet which is connected with a primary alkaline sodium phenolate inlet on a connecting pipeline between the No. 1 extraction and washing tower and the continuous washing separation tower through an outlet pipeline, and the outlet pipeline is provided with a primary alkaline sodium phenolate pump.
Buffer tanks are respectively arranged at the bottoms of the No. 1 extraction washing tower and the No. 2 extraction washing tower, a full-flow loop is arranged on one side of the tower body above the buffer tanks, and an interface regulator is arranged on the full-flow loop.
Compared with the prior art, the invention has the beneficial effects that:
the method utilizes the characteristics of good oil-water separation effect of the spray type washing process and high reaction efficiency of the pre-pump mixed type washing process, utilizes the spray type washing process to wash unwashed mixed parts for the first time, utilizes the pre-pump mixed type process to wash for the second time, and utilizes the spray type washing process to wash for the third time, so that the reaction efficiency is high and the oil-water separation effect is good.
Drawings
FIG. 1 is a schematic diagram of a combined dephenolization washing system combining counter-spray and pre-pump mixing according to the present invention.
In the figure: 1.1# extraction and washing tower 2, a primary dephenolization buffer tank 3, a neutral sodium phenolate pump 4, a secondary continuous washing pump 5, a continuous washing separation tower 6, a secondary dephenolization buffer tank 7, a tertiary continuous washing pump 8, an interface regulator 9, a secondary alkaline sodium phenolate tank 10, a secondary alkaline sodium phenolate pump 11.2# extraction and washing tower 12, and a primary alkaline sodium phenolate pump
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in figure 1, the combined dephenolization washing process combining the opposite spray type and the front-pump hybrid type comprises at least one opposite spray type dephenolization washing process and at least one front-pump hybrid type dephenolization washing process, wherein the separation of products is completed by adopting the opposite spray type dephenolization washing process.
A combined dephenolization washing process combining a spray type and a pre-pump hybrid type, comprising the following steps:
1) The unwashed mixed parts and the secondary alkaline sodium phenolate are respectively pumped into a No. 1 extraction and washing tower 1 for primary washing, the unwashed mixed parts enter a distribution plate at the lower part of the No. 1 extraction and washing tower 1 for upward spraying, the secondary alkaline sodium phenolate enters a distribution plate at the upper part of the No. 1 extraction and washing tower 1 for downward spraying, the unwashed mixed parts and the secondary alkaline sodium phenolate are in countercurrent contact in the No. 1 extraction and washing tower 1, the residual alkali components of the secondary alkaline sodium phenolate are neutralized by phenol in the unwashed mixed parts, and a small amount of mixed parts carried by the alkaline sodium phenolate are extracted to obtain neutral sodium phenolate; the neutral sodium phenolate aqueous solution of the product obtained after the neutral sodium phenolate stays for a period of time is fully flowed to the buffer tank at the bottom in a full-flow mode through the interface regulator 8, and then is sent out by the neutral sodium phenolate pump 3; in the process, the unwashed mixed parts undergo one-time washing to obtain one-time dephenolized mixed parts;
2) Mixing the primary dephenolization mixed part with excessive primary alkaline sodium phenolate before a secondary continuous washing pump 4 for secondary washing after the primary dephenolization mixed part passes through a primary dephenolization buffer tank 2, stirring by the secondary continuous washing pump 4, fully reacting phenol in the primary dephenolization mixed part with alkali in the excessive primary alkaline sodium phenolate, enabling the obtained secondary alkaline sodium phenolate and the secondary dephenolization mixed part to enter a tower from the middle part of a continuous washing separation tower 5, carrying out standing oil-water separation on the alkaline sodium phenolate and the dephenolization mixed part, obtaining secondary alkaline sodium phenolate after dephenolization washing at the tower bottom, and obtaining secondary dephenolization mixed part after washing at the tower top;
3) The secondary dephenolization mixed part is sent into a distribution plate at the lower part of a No. 2 extraction washing tower 11 by a tertiary continuous washing pump 7 to be sprayed upwards, dilute alkali enters the distribution plate at the upper part of the No. 2 extraction washing tower 11 to be sprayed downwards, the washed secondary dephenolization mixed part is in countercurrent contact with dilute alkali in the tower, the dilute alkali neutralizes residual phenol in the washed secondary dephenolization mixed part, and a small amount of alkaline sodium phenolate carried in the washed secondary dephenolization mixed part is extracted to obtain washed mixed part; after the washed mixed parts stay for a period of time, the washed mixed parts of the product are obtained; in the process, the diluted alkali is washed to obtain primary alkaline sodium phenolate, the mixed diluted alkali solution is primary alkaline sodium phenolate, and the primary alkaline sodium phenolate is fully flowed into a buffer tank at the lower part in a full-flow mode through an interface regulator 8 and is sent to secondary washing by a primary alkaline sodium phenolate pump 12.
A combined dephenolization washing system for realizing the process comprises a No. 1 extraction washing tower 1, a secondary alkaline sodium phenolate tank 9, a continuous washing separation tower 5 and a No. 2 extraction washing tower 11; the upper part and the lower part of the No. 1 extraction washing tower 1 are respectively provided with a distribution disc, the distribution disc at the lower part is provided with an unwashed mixed part inlet, the distribution disc at the upper part is provided with a secondary alkaline sodium phenolate inlet and is connected with a secondary alkaline sodium phenolate tank 9 through an inlet pipeline, and the inlet pipeline is provided with a secondary alkaline sodium phenolate pump 10; the distribution plate at the upper part of the No. 1 extraction washing tower 1 is provided with a plurality of lower nozzles, and the distribution plate at the lower part is provided with a plurality of upper nozzles; the bottom of the No. 1 extraction washing tower 1 is provided with a product neutral sodium phenolate outlet; the top of the No. 1 extraction washing tower 1 is provided with a primary dephenolization mixture outlet, a primary dephenolization mixture inlet in the middle of the washing separation tower 5 is connected through a pipeline, and a primary dephenolization buffer tank 2, a primary alkaline sodium phenolate inlet and a secondary continuous washing pump 4 are sequentially arranged on the pipeline along the material conveying direction; the bottom of the continuous washing separation tower 5 is provided with a washed secondary alkaline sodium phenolate outlet, and is connected with a secondary alkaline sodium phenolate tank 9 through a pipeline, and an interface regulator 8 is arranged on the pipeline; the upper part of the continuous washing separation tower 5 is provided with a secondary dephenolization mixed part outlet, the secondary dephenolization mixed part outlet is connected with a secondary dephenolization mixed part inlet of a distribution plate at the lower part of the No. 2 extraction washing tower 11 through a pipeline, the pipeline is sequentially provided with a secondary dephenolization buffer tank 6 and a tertiary continuous washing pump 7 along the material conveying direction, the distribution plate at the upper part of the No. 2 extraction washing tower 11 is provided with a dilute alkali inlet, the distribution plate at the upper part of the No. 2 extraction washing tower 11 is provided with a plurality of lower nozzles, and the distribution plate at the lower part is provided with a plurality of upper nozzles; the top of the No. 2 extraction and washing tower 11 is provided with a washed mixed part outlet, the bottom is provided with a primary alkaline sodium phenolate outlet which is connected with a primary alkaline sodium phenolate inlet on a connecting pipeline between the No. 1 extraction and washing tower 1 and the continuous washing separation tower 5 through an outlet pipeline, and the outlet pipeline is provided with a primary alkaline sodium phenolate pump 12.
Buffer tanks are respectively arranged at the bottoms of the No. 1 extraction and washing tower 1 and the No. 2 extraction and washing tower 11, a full-flow loop is arranged on one side of the tower body above the buffer tanks, and an interface regulator 8 is arranged on the full-flow loop.
The invention is centered on the pre-pump mixed washing process, namely centered on the secondary washing, which is focused on complete reaction, has low separation effect requirement and can endure certain fluctuation. The secondary washing process is that the primary dephenolization mixed part and excessive primary alkaline sodium phenolate are mixed before a pump, phenol in the primary dephenolization mixed part fully reacts with alkali in the excessive primary alkaline sodium phenolate through stirring by the pump to obtain secondary alkaline sodium phenolate and secondary dephenolization mixed part, and the secondary alkaline sodium phenolate and secondary dephenolization mixed part enters a continuous washing separation tower 5 to be subjected to standing oil-water separation, the secondary alkaline sodium phenolate after dephenolization washing is obtained at the bottom, and the secondary dephenolization mixed part after washing is obtained at the top.
The oil-water separation of the pre-pump mixed washing process is not very good, the secondary alkaline sodium phenolate obtained by the pre-pump mixed washing process contains mixed parts with certain components, the secondary alkaline sodium phenolate is washed and extracted by using the raw material unwashed mixed parts (namely, the pre-pump mixed washing is adopted to be the secondary washing, the pre-pump mixed washing is adopted to be the primary washing), the residual alkali components of the secondary alkaline sodium phenolate are neutralized by phenol in the unwashed mixed parts, and meanwhile, the mixed parts carried by the alkaline sodium phenolate are extracted, so that the residence time of the sodium phenolate is properly prolonged, and the qualified neutral sodium phenolate aqueous solution is obtained. The key point of one washing is that the residence time of the mixed part of one dephenolization is not high, but the residence time of the neutral sodium phenolate is properly prolonged so as to ensure the qualification of the neutral sodium phenolate of the product. Of course, the unwashed mixture is also subjected to a wash here.
The mixed washing process before the pump is not very good in oil-water separation effect, the secondary dephenolized mixed part after washing is obtained at the top of the mixed washing process before the pump, alkaline sodium phenolate with a certain component and unreacted residual phenol are contained, the mixed part is washed and extracted again for three times by using dilute alkali through the spray washing process, the residual phenol of the mixed part is neutralized by the dilute alkali, meanwhile, the alkaline sodium phenolate carried by the mixed part is extracted, and the residence time of the washed mixed part is properly prolonged, so that the qualified washed mixed part is obtained. The key point of the three times of washing is that the residence time of the alkaline sodium phenolate is not high, but the residence time of the washed mixed parts is properly prolonged so as to ensure the qualification of the product.
The oil-water separation effect of the spray type washing process is very good, the oil or water separation time in the spray type washing process can be properly prolonged, the defects of poor oil-water separation effect and frequent fluctuation of the pre-pump mixed type washing process can be overcome, and the whole process achieves a stable operation effect.
The invention describes in detail a combined dephenolization washing process with three washing processes, namely: the first washing and the third washing are of a counter-spray type, the second washing is of a pre-pump mixing type, but the combined dephenolization washing process is not limited to the combination mode, and other combination modes can be adopted, such as a first washing and a fourth washing are of a counter-spray type, the second washing and the third washing are of a pre-pump mixing type, or more combined washing processes are adopted. The principle is that a pre-pump mixed washing process is used as a main implementation process of dephenolization washing, but a process related to products (comprising a product neutral sodium phenolate aqueous solution and a product washed mixed part) is completed by a counter-spray washing process; the most preferred embodiment is that at least the first wash and the last wash are performed using a counter-spray wash process.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (3)
1. The combined dephenolization washing process combining the opposite spray type and the front-pump type is characterized by comprising at least one opposite spray type dephenolization washing process and at least one front-pump type mixed dephenolization washing process, wherein the separation of products is completed by adopting the opposite spray type dephenolization washing process; the method specifically comprises the following steps:
1) The unwashed mixed parts and the secondary alkaline sodium phenolate are respectively pumped into a No. 1 extraction and washing tower for primary washing, the unwashed mixed parts enter a distribution plate at the lower part of the No. 1 extraction and washing tower for upward spraying, the secondary alkaline sodium phenolate enters a distribution plate at the upper part of the No. 1 extraction and washing tower for downward spraying, the unwashed mixed parts and the secondary alkaline sodium phenolate are in countercurrent contact in the No. 1 extraction and washing tower, the residual alkali components of the secondary alkaline sodium phenolate are neutralized by phenol in the unwashed mixed parts, and a small amount of mixed parts carried by the alkaline sodium phenolate are extracted to obtain neutral sodium phenolate; the neutral sodium phenolate aqueous solution of the product obtained after the neutral sodium phenolate stays for a period of time is fully flowed to the buffer tank at the bottom in a full-flow mode through the interface regulator, and then is pumped out by the neutral sodium phenolate; in the process, the unwashed mixed parts undergo one-time washing to obtain one-time dephenolized mixed parts;
2) Mixing the primary dephenolization mixed part with excessive primary alkaline sodium phenolate before a secondary continuous washing pump for secondary washing after the primary dephenolization mixed part passes through a primary dephenolization buffer tank, stirring by the secondary continuous washing pump, fully reacting phenol in the primary dephenolization mixed part with alkali in the excessive primary alkaline sodium phenolate, enabling the obtained secondary alkaline sodium phenolate and the secondary dephenolization mixed part to enter a tower from the middle part of a continuous washing separation tower, carrying out standing oil-water separation of the alkaline sodium phenolate and the dephenolization mixed part, obtaining secondary alkaline sodium phenolate after dephenolization washing at the tower bottom, and obtaining secondary dephenolization mixed part after washing at the tower top;
3) The secondary dephenolization mixed part is sent into a distribution plate at the lower part of a No. 2 extraction washing tower by a tertiary continuous washing pump to be sprayed upwards, dilute alkali enters the distribution plate at the upper part of the No. 2 extraction washing tower to be sprayed downwards, the washed secondary dephenolization mixed part is contacted with dilute alkali in a countercurrent manner in the tower, the dilute alkali neutralizes residual phenol in the washed secondary dephenolization mixed part, and a small amount of alkaline sodium phenolate carried in the washed secondary dephenolization mixed part is extracted to obtain washed mixed part; after the washed mixed parts stay for a period of time, the washed mixed parts of the product are obtained; in the process, the diluted alkali is washed to obtain primary alkaline sodium phenolate, the mixed diluted alkali solution is primary alkaline sodium phenolate, and the primary alkaline sodium phenolate is fully flowed into a buffer tank at the lower part in a full-flow mode through an interface regulator, and is pumped to be washed for the second time by the primary alkaline sodium phenolate.
2. A combined dephenolization scrubber system for carrying out the process of claim 1, comprising a # 1 extraction scrubber, a secondary alkaline sodium phenolate tank, a continuous wash separator, and a # 2 extraction scrubber; the upper part and the lower part of the No. 1 extraction washing tower are respectively provided with a distribution disc, the distribution disc at the lower part is provided with an unwashed mixed part inlet, the distribution disc at the upper part is provided with a secondary alkaline sodium phenolate inlet and is connected with a secondary alkaline sodium phenolate tank through an inlet pipeline, and the inlet pipeline is provided with a secondary alkaline sodium phenolate pump; the distribution plate at the upper part of the No. 1 extraction washing tower is provided with a plurality of lower nozzles, and the distribution plate at the lower part is provided with a plurality of upper nozzles; the bottom of the No. 1 extraction washing tower is provided with a product neutral sodium phenolate outlet; the top of the No. 1 extraction washing tower is provided with a primary dephenolization mixture outlet, a primary dephenolization mixture inlet in the middle of the washing separation tower is connected through a pipeline, and a primary dephenolization buffer tank, a primary alkaline sodium phenolate inlet and a secondary continuous washing pump are sequentially arranged on the pipeline along the material conveying direction; the bottom of the continuous washing separation tower is provided with a washed secondary alkaline sodium phenolate outlet, the secondary alkaline sodium phenolate tank is connected through a pipeline, and an interface regulator is arranged on the pipeline; the upper part of the continuous washing separation tower is provided with a secondary dephenolization mixed part outlet, the secondary dephenolization mixed part outlet is connected with a secondary dephenolization mixed part inlet of a lower distribution plate of the No. 2 extraction washing tower through a pipeline, the pipeline is sequentially provided with a secondary dephenolization buffer tank and a tertiary continuous washing pump along the material conveying direction, the distribution plate at the upper part of the No. 2 extraction washing tower is provided with a dilute alkali inlet, the distribution plate at the upper part of the No. 2 extraction washing tower is provided with a plurality of lower nozzles, and the distribution plate at the lower part is provided with a plurality of upper nozzles; the top of the No. 2 extraction and washing tower is provided with a washed mixed part outlet, the bottom of the No. 2 extraction and washing tower is provided with a primary alkaline sodium phenolate outlet which is connected with a primary alkaline sodium phenolate inlet on a connecting pipeline between the No. 1 extraction and washing tower and the continuous washing separation tower through an outlet pipeline, and the outlet pipeline is provided with a primary alkaline sodium phenolate pump.
3. The combined dephenolization washing system of claim 2, wherein the bottoms of the No. 1 extraction washing tower and the No. 2 extraction washing tower are respectively provided with a buffer tank, one side of the tower body above the buffer tank is provided with a full-flow loop, and the full-flow loop is provided with an interface regulator.
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| CN103242877A (en) * | 2013-04-25 | 2013-08-14 | 新疆鑫联煤化工有限公司 | Method for washing and decomposing industrial naphthalene in oil tar processing process |
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| CN209778756U (en) * | 2019-03-11 | 2019-12-13 | 中冶焦耐(大连)工程技术有限公司 | combined dephenolizing washing system combining opposite spraying and pre-pump mixing |
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| DE1158521B (en) * | 1960-07-21 | 1963-12-05 | Still Fa Carl | Process for the extraction of phenols from waste water |
| CN103242877A (en) * | 2013-04-25 | 2013-08-14 | 新疆鑫联煤化工有限公司 | Method for washing and decomposing industrial naphthalene in oil tar processing process |
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