CN202626058U - Technical system for producing ethanol from acetate and selectively coproducing 2-butanol - Google Patents
Technical system for producing ethanol from acetate and selectively coproducing 2-butanol Download PDFInfo
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- CN202626058U CN202626058U CN 201220194360 CN201220194360U CN202626058U CN 202626058 U CN202626058 U CN 202626058U CN 201220194360 CN201220194360 CN 201220194360 CN 201220194360 U CN201220194360 U CN 201220194360U CN 202626058 U CN202626058 U CN 202626058U
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Abstract
The utility model relates to a technical system for producing ethanol from acetate and selectively coproducing 2-butanol, which comprises a hydrogenation reactor, a gas-liquid separator, an acetate recovery tower, an ethanol rectification tower, an azeotropic rectification tower, an azeotrope former recovery tower and a adsorption tank. The hydrogenation reaction temperature can be adjusted to selectively coproduce 2-butanol. The catalyst, technique and device adopted by the utility model have the characteristics of high activity, high selectivity, high yield, strong market adaptability, low equipment investment, environment friendliness, simple preparation technique, high economy and practicality and the like. Meanwhile, due to the high single-pass conversion rate, the utility model effectively utilizes the reaction heat, greatly reduces the load for separating the crude product, shortens the production process, and greatly lowers the production energy consumption.
Description
Technical field
The utility model relates to the process system of acetic ester hydrogenation preparing ethanol and selectivity coproduction 2-butanols.
Background technology
Ethanol is important basic chemical raw materials; Be used to make acetaldehyde, ethene, ethamine, vinyl acetic monomer, acetic acid, monochloroethane etc.; And derive many midbodys of products such as medicine, dyestuff, coating, spices, viton, washing composition, agricultural chemicals; Its goods nearly more than 300 kinds, similar with methyl alcohol, can make the energy and use by ethanol.The country that has has begun to make automobile fuel with ethanol separately or has mixed and use in the gasoline (more than 10%) to practice thrift gasoline.
The 2-butanols is as the midbody of producing methylethylketone, is used to make N-BUTYL ACETATE, secondary butyl ester, can be used as softening agent, dressing agent, weedicide, solvent etc.
Patent CN102327774A discloses acetic ester and has prepared the alcoholic acid method.What adopt is to be active ingredient with copper; Auxiliary agent be selected from Zn with lanthanon in one or several; Carrier is selected from the catalyzer of silicon-dioxide or aluminum oxide, and it is that 140-210 ℃, pressure are that 0.3MPa～3MPa, hourly space velocity are 0.3～1.2H in temperature of reaction
-1, hydrogen gas space velocity is 2000～6000H
-1Condition under, the reaction peak rate of conversion be merely 85%, the ethanol selectivity is merely 91%.
The disclosed acetic ester preparation of ethanol by hydrogenating of patent CN102093162A catalyzer; What adopt is to be active ingredient with 5～50% bronze medals, auxiliary agent be selected from Mn in the element one or several, be about 1～10%; Carrier is selected from silicon-dioxide; It is that 300 ℃, pressure are under the condition of 5MPa in temperature of reaction, obtains the highest space-time yield and is merely 1.55g/ (g catalyzer h), and the ethanol selectivity is merely 97%.
At present about generally little in the bibliographical information of acetic ester preparation of ethanol by hydrogenating to the regulation range of hydrogenation products composition; Be not enough to tackle the ethanol that the variation of the market requirement causes or the fluctuation of 2-butanols product price, report in addition about the hydrogenation technique full-flow process.And the catalyzer that adopts institute's report method preparation has tangible transformation efficiency, selectivity is low, and space-time yield is low, and yield is low, and bed pressure drop is high, and temperature of reaction is high, and the hydrogen ester ratio is high, weak points such as energy consumption height.
The utility model content
The purpose of the utility model is to overcome the deficiency of above-mentioned prior art, and the process system of a kind of acetic ester shortening system ethanol and coproduction 2-butanols is provided, and can optionally produce alcohol product or ethanol coproduction 2-butanols product according to the market requirement.
The utility model adopts following technical scheme:
A kind of acetic ester shortening is produced the process system of ethanol and selectivity coproduction 2-butanols, it is characterized in that, comprises hydrogenator, gas-liquid separator, acetic ester regenerating column, ethanol rectifying tower, azeotropy rectification column, entrainer regenerating column and adsorption tanks; Wherein: the inlet of hydrogenator is connected with feed pipe; The outlet of hydrogenator is connected with the inlet of gas-liquid separator; The liquid exit of gas-liquid separator is connected with the inlet of acetic ester regenerating column, and the tower still outlet of acetic ester regenerating column is connected with the inlet of ethanol rectifying tower, and the tower still outlet of ethanol rectifying tower is connected with the inlet of azeotropy rectification column; The tower top outlet of azeotropy rectification column is connected with the inlet of entrainer regenerating column, and the tower still outlet of entrainer regenerating column is connected with the inlet of adsorption tanks.
Preferably; Also include interchanger in the above-mentioned process system; The outlet of said hydrogenator is connected with the inlet of gas-liquid separator through the hot-fluid side of said interchanger, and said feed pipe is connected with the inlet of said hydrogenator through the cold flow side of said interchanger.
Preferably, the pneumatic outlet of said gas-liquid separator is connected with the cold flow side of said interchanger.
Preferably, the tower top outlet of said acetic ester regenerating column is connected with said feed pipe.
Preferably, also include phase splitter in the above-mentioned process system, the tower top outlet of said azeotropy rectification column is connected with the inlet of said phase splitter, and the oil phase outlet of said phase splitter is connected with the inlet of entrainer regenerating column.
Preferably, also include water cooler in the above-mentioned process system, the outlet of said adsorption tanks links to each other with the inlet of said water cooler.
Preferably, said adsorption tanks are provided with two or more.
Preferably, the outlet of the tower still of entrainer regenerating column is connected with the inlet heater via of adsorption tanks.
The beneficial effect of the utility model is: the utility model carries out the hydrogenation purifying through the industrial acetic acid ester, and product obtains ethanol and coproduction 2-butanols after rectification and purification and dehydration.The catalyzer that this process system adopted is Cu-Zn-M/SiO
2(M is selected from a kind of among Ir, Mn, W, Ru, the Zr and more than one is compound) is through adjustment temperature of reaction, optionally coproduction 2-butanols.Catalyzer, technology and device that the utility model adopts have high reactivity, highly selective, high yield, characteristics such as market adaptability is strong, facility investment is few, environmental friendliness, preparation technology are simple, economical and practical.Because per pass conversion is high, reaction heat is effectively utilized simultaneously, alleviate the load of thick product separation greatly, shortened Production Flow Chart, production energy consumption also reduces significantly.
Description of drawings
Fig. 1 is the process flow sheet of the utility model;
Among the figure: 1 is hydrogenator, and 2 is interchanger, and 3 is gas-liquid separator, and 4 is the acetic ester regenerating column, and 5 is the ethanol rectifying tower, and 6 is azeotropy rectification column, and 7 is the entrainer regenerating column, and 8A/8B is adsorption tanks, and 9 is 2-butanols product jar, and 10 is phase splitter.
Embodiment
The utility model provides a kind of acetic ester shortening to produce the technology and the process matched therewith equipment thereof of ethanol and coproduction 2-butanols, can optionally produce alcohol product or ethanol coproduction 2-butanols product according to the market requirement.For reaching this purpose, the technique means that the utility model adopts is: with Cu-Zn-M/SiO
2(M is selected from a kind of among Ir, Mn, W, Ru, the Zr and more than one is compound) is hydrogenation catalyst, and through adjustment temperature of reaction controlled target product.When controlling the hydrogenation reaction temperature is 150～260 ℃, and the hydrogen ester ratio is 10～20, and the weight liquid hourly space velocity is 3.0～5.0h
-1The time, the per unit area yield alcohol product, the acetic ester transformation efficiency can reach 98%, ethanol selectivity 99.99%.For coproduction 2-butanols, can change temperature of reaction is 280～320 ℃, and the hydrogen ester ratio is 10～20, weight liquid hourly space velocity 3.0～5.0h
-1, this moment, the acetic ester transformation efficiency was 98%, ethanol selectivity 96.03%, and 2-butanols selectivity is 3.97%.
The utility model also further provides comparison system, complete process method and the process matched therewith equipment thereof of from the product of ethanol coproduction 2-butanols, isolating sub product 2-butanols.
The raw material of acetic ester described in the utility model can be selected one or both in the middle of the ritalin, vinyl acetic monomer for use.With different acetic esters is that the raw material hydrogenation products that carries out being obtained behind the hydrogenation is different, and for example: hydrogenation obtains methyl alcohol and ethanol when being raw material with the ritalin, and hydrogenation obtains ethanol when being raw material with the vinyl acetic monomer.Therefore; When adopting different acetic ester raw materials to carry out hydrogenation; The process of hydrogenation reaction product being separated purification can be slightly different, and be mainly reflected in: the cat head tower kettle product of acetic ester regenerating column can be different, contain product methyl alcohol in the acetic ester that cat head obtains when being raw material with the ritalin; Need methyl alcohol is carried out carrying out cyclically utilizing again after the Separation and Recovery, the tower still directly obtains alcohol product; The acetic ester that cat head obtains when being raw material with the vinyl acetic monomer can directly carry out cyclically utilizing, and the tower still directly obtains alcohol product.Separation of methanol can adopt rectification process commonly used in this area from acetic ester, repeats no more at this.
Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiment only to be used to the utility model is described and be not used in the restriction the utility model scope.Should be understood that in addition those skilled in the art can do any change or modification to the utility model after having read the content that the utility model tells about, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Should be understood that in addition that one or more method stepss of mentioning in the utility model do not repel before and after said combination step can also exist the additive method step or between these steps of clearly mentioning, can also insert the additive method step, except as otherwise noted; The acetic ester that for example obtains at the cat head of acetic ester regenerating column carries out can also increasing the sepn process of methyl alcohol in the cyclically utilizing process.Will also be understood that; The relation of being connected between one or more equipment/device of mentioning in the utility model is not repelled before and after said clustered aggregates/device and can also be had other equipment/devices or between these two equipment/devices clearly mentioning, can also insert other equipment/devices, except as otherwise noted; For example, increase the continuous methanol distillation column of tower top outlet with it in the back of said acetic ester regenerating column.
Notice, below the experimental technique of unreceipted actual conditions among the embodiment, usually according to normal condition, like the chemical industry operation handbook, or the condition of advising according to manufacturer.Not concrete processing unit that indicates or device all adopt conventional equipment or the device in this area in the following example; All force value and scope all are meant gauge pressure.
See also Fig. 1; The acetic ester shortening that the utility model provided is produced the process system of ethanol and selectivity coproduction 2-butanols, comprises hydrogenator 1, gas-liquid separator 3, acetic ester regenerating column 4, ethanol rectifying tower 5, azeotropy rectification column 6, entrainer regenerating column 7 and adsorption tanks 8A, 8B; Wherein: the inlet of hydrogenator 1 is connected with feed pipe; The outlet of hydrogenator 1 is connected with the inlet of gas-liquid separator 3; The liquid exit of gas-liquid separator 3 is connected with the inlet of acetic ester regenerating column 4; The tower still outlet of acetic ester regenerating column 4 is connected with the inlet of ethanol rectifying tower 5; The tower still outlet of ethanol rectifying tower 5 is connected with the inlet of azeotropy rectification column 6, and the tower top outlet of azeotropy rectification column 6 is connected with the inlet of entrainer regenerating column 7, and the tower still outlet of entrainer regenerating column 7 is connected with the inlet of adsorption tanks 8A, 8B.When needs per unit area yield ethanol, the temperature of reaction in the control hydrogenator 1 is 150～260 ℃, and the tower still discharging of acetic ester regenerating column 4 can obtain highly purified alcohol product.When needs are produced ethanol and coproduction 2-butanols; Temperature of reaction in the control hydrogenator 1 is 280～320 ℃; The tower still discharging of acetic ester regenerating column 4 gets into ethanol rectifying tower 5 and separates; The cat head of ethanol rectifying tower 5 or side line discharging are alcohol product, and its tower still discharging obtains sub product 2-butanols further through the processing of azeotropy rectification column 6, entrainer regenerating column 7 and adsorption tanks 8A, 8B.
Further, also include interchanger 2 in the above-mentioned process system, the outlet of hydrogenator 1 is connected with the inlet of gas-liquid separator 3 through the hot-fluid side of interchanger 2, and said feed pipe is connected with the inlet of hydrogenator 1 through the cold flow side of interchanger 2.Said feed pipe comprises acetic ester material feeding tube road 11 and hydrogen feed feed pipe 12; Wherein, Acetic ester material feeding tube road 11 and hydrogen feed feed pipe 12 merge into the inlet that is connected to the cold flow side of interchanger 2 behind the pipeline 14 again, and the outlet on the cold flow side of interchanger 2 is connected with the inlet of hydrogenator 1 through pipeline 15.The reaction heat that can make full use of hydrogenation reaction that is provided with of interchanger 2 carries out preheating to raw material, to cut down the consumption of energy.
Further, the recycling technology of the raw material that the utility model also is provided with: the hydrogen that the pneumatic outlet of gas-liquid separator 3 is reclaimed converges in the pipeline 14 through pipeline 18 and is connected with the cold flow side of interchanger 2, so that hydrogen is recycled; The acetic ester that the tower top outlet of acetic ester regenerating column 4 is reclaimed converges to acetic ester material feeding tube road 11 through pipeline 21, recycles with the Dichlorodiphenyl Acetate ester; The entrainer that the tower top outlet of entrainer regenerating column 7 is reclaimed returns azeotropy rectification column 6, so that entrainer is recycled.
Further, also include phase splitter 10 in the above-mentioned process system, the tower top outlet of azeotropy rectification column 6 is connected with the inlet of phase splitter 10, and the oil phase outlet of phase splitter 10 is connected with the inlet of entrainer regenerating column 7.The bottom of phase splitter 10 is that water is handled through pipeline 28 direct discharges, and the part in the oil phase on its top is back in the azeotropy rectification column 6, and remaining part gets in the entrainer regenerating columns 7 through pipeline 27 and reclaims entrainer.
Further, also include water cooler in the above-mentioned process system, the outlet of adsorption tanks 8A, 8B links to each other with the inlet of said water cooler.The sorbent material that loads in the adsorption tanks can carry out selective adsorption to 2-fourth alcohol and water, and water is adsorbed agent absorption in adsorption tanks, and the 2-butanols gas after dewatering from the molecular sieve adsorption jar obtains anhydrous 2-butanols product after said water cooler cooling.
Further, said adsorption tanks are provided with two or more, are used for alternately accomplishing successively absorption, desorption manipulation, realize the operation of charging and extraction continous-stable.
Further, the tower still of entrainer regenerating column 7 outlet is connected with the inlet heater via of adsorption tanks 8A, 8B, is used for getting into adsorption tanks after tower still discharging with entrainer regenerating column 7 is heated to certain temperature.
The technical process that the utility model provided is (is that vinyl acetic monomer is an example with the raw material) as follows: the acetic ester raw material is through pipeline 12; With converge from the hydrogen in pipeline 13 and the pipeline 18 after piping 14 gets into hydrogenators 1 through pipeline 15 after getting into interchanger 2 gasifications and preheating; Carry out catalytic hydrogenation reaction at this; Reaction product behind the hydrogenation flows out from pipeline 16; And carry out gas-liquid separation through interchanger 2 heat exchange after pipeline 17 flows into gas-liquid separators 3, gaseous component except that a small amount of non-condensable gas from pipeline 19 emptying, all the other most of recycle hydrogens are discharged and after supercharging Yu from the hydrogen make-up of pipeline 13, are converged from pipeline 18.Liquid phase part in the gas-liquid separator 3 then gets into acetic ester regenerating column 4 from pipeline 20, and cat head is isolated acetic ester solution, recycles after converging through pipeline 21 and from the additional material of the acetic ester of pipeline 11.The heavy constituent that contain ethanol and 2-butanols and less water in the acetic ester regenerating column 4 tower stills get into ethanol rectifying tower 5 from pipeline 22; The isolated alcohol product of cat head or side line also flows out from pipeline 24; The heavy constituent that the tower still contains 2-fourth alcohol and water then converge back entering azeotropy rectification column 6 from pipeline 25 and entrainer from the recovery of the additional entrainer of pipeline 30 and pipeline 29; Waste water after this tower still is azeotropic distillation; It carries out environmental protection treatment after pipeline 26 is discharged, the ternary azeotrope of the 2-butanols in the cat head, entrainer hexanaphthene and water gets into phase splitter 10 after the overhead condenser condensation.The water of phase splitter 10 bottoms is discharged through pipeline 28 and is handled; The oil phase on top is except that a part refluxes; All the other all get into entrainer regenerating columns 7 through pipeline 27, carry out reuse at the isolated light constituent entrainer of this cat head through pipeline 29, and after the 2-butanols heavy constituent that the tower still contains less water get into well heaters and be preheated to certain temperature through pipeline 31; Getting into molecular sieve adsorption jar 8A/8B (two jars alternate run and regeneration) from pipeline 32 dewaters; The 2-butanols product that dewaters after qualified gets into water coolers through pipeline 33, and the cooling back gets into 2-butanols product jars 9 from pipeline 34, and qualified 2-butanols product is discharged from pipeline 35 continuously.The dotted line directly technical process of per unit area yield 99.7% alcohol product after the processing condition for a change among Fig. 1, alcohol product, directly uses as specification product after pipeline 23 is discharged continuously from the tower still of rectifying tower 4 among the figure.
The process that embodiment 1 produces ethanol and coproduction 2-butanols
In the present embodiment with reference to device shown in the drawings and each reaction component of flow setting.
Technical grade reaction vinyl acetic monomer raw material again after being pressurized to 2MPa, after acetic ester that acetic ester regenerating column 4 cats head come out mixes, and mixes hydrogen (99.2%vol hydrogen, 0.1%volN
2, 0.7%vol ethane) mix after, gasification is preheating to 280 ℃, joins (internal diameter 40mm in the hydrogenator 1; Height 1800mm), be cooled to 50 ℃ of entering gas-liquid separators 3 after the reaction, coming out in gas-liquid separator 3 bottoms, lime set (form: 93.26% ethanol by weight; 3.59% vinyl acetic monomer, 0.98% water, 3.10%2-butanols); On the other hand, eject next noncondensable gas (98.2%vol hydrogen, 0.1%volN from separator
2, 1.7%vol ethane) use as hydrogen feed recycling, wherein 1% non-condensable gas is discharged system.
The lime set that gas-liquid separator 3 comes out imports in the acetic ester regenerating column 4 (internal diameter 32mm, height 3000mm), and acetic ester reclaims about 76 ℃ of 4 tower top temperatures, and column bottom temperature is 85 ℃.The vinyl acetic monomer that cat head steams is back in the hydrogenator 1 as the recycling material and utilizes.On the other hand, (weight consists of 95.81% ethanol, 1.01% water in the heavy constituent that obtain at the bottom of the tower; The 3.18%2-butanols), enter into ethanol rectifying tower 5 (internal diameter 32mm, height 3000mm); Cat head or the side line purity of coming out is 99.5% alcohol product, and the aqueous solution that reorganization is divided into the 2-butanols that contains that comes out at the bottom of the tower on the other hand converges back entering azeotropy rectification column 6 with 0.6wt% entrainer hexanaphthene, at azeotropy rectification column 6 (internal diameter 32mm; Height 3000mm) in; The come out ternary azeotrope of 2-butanols, water and hexanaphthene of cat head gets into phase splitter, takes out a upper oil phase part and refluxes; All the other all get into entrainer regenerating columns 7, after water is told then with the tower still in heavy constituent such as water discharge the battery limit (BL) and handle.At entrainer regenerating column 7 (internal diameter 32mm; Height 3000mm) in; Come out entrainer hexanaphthene and after converging, cycle back to azeotropy rectification column 6 of cat head with the hexanaphthene that replenishes; The isolated 2-butanols heavy constituent that contain less water of tower still are preheated at well heater and get into adsorption tanks 8A/8B (internal diameter 40mm, the height 1800mm) adsorption process of dewatering that the 5A molecular sieve is housed after 140 ℃, and adsorption temp is 160 ℃; Adsorptive pressure is 0.5MPa.Qualified 2-butanols product after the dehydration is discharged continuously and is used after getting into 2-butanols product jar 9.
The process of embodiment 2 per unit area yield alcohol products
In the present embodiment with reference to device shown in the drawings and each reaction component of flow setting.
Technical grade reaction vinyl acetic monomer raw material again after being pressurized to 2MPa, after acetic ester that acetic ester regenerating column 4 cats head come out mixes, and mixes hydrogen (99.6%vol hydrogen, 0.1%volN
2, 0.3%vol ethane) mix after, gasification is preheating to 160 ℃; Join (internal diameter 40mm, height 1800mm) in the hydrogenator 1, be cooled to 50 ℃ of entering gas-liquid separators 3 after the reaction; The gas-liquid separator 3 bottoms lime set (weight consists of 99.7% ethanol, 0.3% water) of coming out, on the other hand; Eject next noncondensable gas (99.3%vol hydrogen, 0.1%volN from gas-liquid separator 3
2, 0.6%vol ethane) use as hydrogen feed recycling, wherein 1% non-condensable gas is discharged system.
The lime set that gas-liquid separator 3 comes out imports in the acetic ester regenerating column 4 (internal diameter 32mm, height 3000mm), about 76 ℃ of acetic ester regenerating column 4 tower top temperatures, and column bottom temperature is 85 ℃.The acetic ester that cat head steams is back in the hydrogenator 1 as the recycling material and utilizes.On the other hand, the qualified alcohol product that obtains at the bottom of the tower (weight consists of 99.5% ethanol).
Embodiment 3-6
Embodiment 3-6 is identical with the foregoing description process, and just wherein concrete processing condition change to some extent, see table 1 for details.
Table 1
The foregoing description is the principle and the effect of exemplary illustration the utility model only, but not is used to limit the utility model.Any be familiar with this technological personage all can be under the spirit and category of the utility model, the foregoing description is modified or is changed.Therefore, have common knowledge the knowledgeable under all in the technical field, must contain by the claim of the utility model not breaking away from all equivalence modification or changes that spirit that the utility model discloses and technological thought are accomplished down.
Claims (7)
1. an acetic ester shortening is produced the process system of ethanol and selectivity coproduction 2-butanols, it is characterized in that, comprises hydrogenator, gas-liquid separator, acetic ester regenerating column, ethanol rectifying tower, azeotropy rectification column, entrainer regenerating column and adsorption tanks; Wherein: the inlet of hydrogenator is connected with feed pipe; The outlet of hydrogenator is connected with the inlet of gas-liquid separator; The liquid exit of gas-liquid separator is connected with the inlet of acetic ester regenerating column, and the tower still outlet of acetic ester regenerating column is connected with the inlet of ethanol rectifying tower, and the tower still outlet of ethanol rectifying tower is connected with the inlet of azeotropy rectification column; The tower top outlet of azeotropy rectification column is connected with the inlet of entrainer regenerating column, and the tower still outlet of entrainer regenerating column is connected with the inlet of adsorption tanks.
2. process system as claimed in claim 1; It is characterized in that; Also include interchanger; The outlet of said hydrogenator is connected with the inlet of gas-liquid separator through the hot-fluid side of said interchanger, and said feed pipe is connected with the inlet of said hydrogenator through the cold flow side of said interchanger.
3. process system as claimed in claim 2 is characterized in that, the pneumatic outlet of said gas-liquid separator is connected with the cold flow side of said interchanger.
4. process system as claimed in claim 1 is characterized in that, the tower top outlet of said acetic ester regenerating column is connected with said feed pipe.
5. process system as claimed in claim 1 is characterized in that, also includes phase splitter, and the tower top outlet of said azeotropy rectification column is connected with the inlet of said phase splitter, and the oil phase outlet of said phase splitter is connected with the inlet of entrainer regenerating column.
6. process system as claimed in claim 1 is characterized in that, also includes water cooler, and the outlet of said adsorption tanks links to each other with the inlet of said water cooler.
7. like arbitrary described process system among the claim 1-6, it is characterized in that the tower still outlet of said entrainer regenerating column is connected with the inlet heater via of adsorption tanks.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103570492A (en) * | 2012-07-26 | 2014-02-12 | 亚申科技研发中心（上海）有限公司 | Process and system for preparation of ethanol through hydrogenation of crude methyl acetate by-product obtained in production of polyvinyl alcohol |
| CN106916045A (en) * | 2017-03-10 | 2017-07-04 | 钦州学院 | A kind of method of separating benzene-cyclohexane and sec-butyl alcohol |
-
2012
- 2012-04-28 CN CN 201220194360 patent/CN202626058U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103570492A (en) * | 2012-07-26 | 2014-02-12 | 亚申科技研发中心（上海）有限公司 | Process and system for preparation of ethanol through hydrogenation of crude methyl acetate by-product obtained in production of polyvinyl alcohol |
| CN103570492B (en) * | 2012-07-26 | 2015-09-09 | 亚申科技研发中心（上海）有限公司 | The technique of the crude methyl acetate hydrogenation of net product ethanol of by-product and system in a kind of polyvinyl alcohol production process |
| CN106916045A (en) * | 2017-03-10 | 2017-07-04 | 钦州学院 | A kind of method of separating benzene-cyclohexane and sec-butyl alcohol |
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