CN1974544A - Process of producing acrylamide crystal in an integral centrifuging, dewatering and drying machine - Google Patents
Process of producing acrylamide crystal in an integral centrifuging, dewatering and drying machine Download PDFInfo
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- CN1974544A CN1974544A CN 200610070642 CN200610070642A CN1974544A CN 1974544 A CN1974544 A CN 1974544A CN 200610070642 CN200610070642 CN 200610070642 CN 200610070642 A CN200610070642 A CN 200610070642A CN 1974544 A CN1974544 A CN 1974544A
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Abstract
The present invention relates to process of producing acrylamide crystal in an integral centrifuging, dewatering and drying machine. The technological scheme includes the following steps: 1. pressurizing high concentration acrylamide solution into the machine, water cooling to regulate the inside temperature to 0-10 deg.c to separate out crystal; 2. starting the vacuum system and centrifuging device after crystallization to transfer the residual solution to the storage tank; and 3. heating to 25-40 deg.c after eliminating the residual solution to obtain crystal. The present invention has the advantages of low power consumption, less investment in apparatus and simple technological process.
Description
One, technical field:
The present invention relates to a kind of crystallization method of acrylamide soln, the method that particularly a kind of usefulness is centrifugal, acrylamide crystal is produced in dehydration, dry all-in-one.
Two, background technology:
Domestic acrylamide production is main in the past adopts traditional sulfuric acid hydration process and copper catalytic hydration, domesticly begins to research and develop microbial method from the eighties in 20th century and produces the acrylamide technology.At present domestic one have the manufacturing enterprise of tame acrylamide more than ten, all adopt microbial method, about 350,000 tons/year of aggregated capacity, actual ultimate production was nearly 200,000 tons in 2004.It is for sale that wherein part acrylamide that enterprise produces all is used as commodity; Part enterprise is all from being used to produce polyacrylamide; Also have part enterprise partly to use by oneself in producing polyacrylamide, part is for sale.The fluidised bed drying crystallization is mainly adopted in the production of existing acrylamide crystal, because acrylamide has toxicity, therefore need in process of production to carry out closed-loop operation, and that traditional fluidized bed plant is difficult for is airtight, material easily flies away, and drying crystalline Technology complexity, parameter control difficulty is bigger, and energy consumption is big, and facility investment is big, loss is big, to shortcomings such as surrounding environment influence are big.
Three, summary of the invention:
Purpose of the present invention is exactly the above-mentioned defective that exists at prior art, the method for provide a kind of and have that flow process is short, energy consumption is low, quality product is high, less investment, usefulness that production cost is low are centrifugal, acrylamide crystal is produced in dehydration, dry all-in-one.
Its technical scheme is: may further comprise the steps:
(1) acrylamide soln with high density is pressed in the all-in-one, open the refrigerated water terminal valve of chuck, attemperation makes internal temperature remain on 0 ℃-10 ℃, make feed liquid when low temperature, separate out crystal, by form observation feed liquid crystallization situation, and by the concentration of the acrylamide in the thief hole sampling detection solution, to determine the crystalline situation;
(2) after crystallization forms, open vacuum system and centrifugal device and by centrifugal and vacuum take-off the surplus solution in the equipment is extracted in the storage tank, recovery etc. are pending;
(3) after solution centrifugal suction residual in the equipment finishes, open the stirring ribbon of all-in-one, and open ribbon steam inlet valve and water of condensation valve, open hot water entrance's valve of the chuck of all-in-one bottom cone simultaneously, regulate the one built-in temperature and remain on 25 ℃-40 ℃, carry out drying, thereby obtain highly purified acrylamide crystal;
Behind dry 3 hours of the crystal, the materials device of leaving soon of opening the cone bottom picks out qualified crystal, packs.
The invention has the beneficial effects as follows: it is big that (1) has overcome the energy consumption that adopts the fluidised bed drying crystallization to produce acrylamide crystal in the existing acrylamide crystal production technique, facility investment is big, shortcomings such as complex process, it is low to have energy consumption, facility investment is few, the high outstanding beneficial effect of technology purity simple to operation; (2) temperature when adjusting crystallization makes the solution sufficient crystallising, by the centrifugation remaining liq, carries out the finally purified acrylamide crystal of acquisition of drying at last under certain vacuum condition and the temperature that is fit to; (3) this technology has important role in the dependence, the science and technology innovation of encouragement China, the development of national industry that promote China's acrylamide industry to reduce foreign technology.
Four, description of drawings:
Accompanying drawing 1 is the structural representation and the schema of centrifugal, dehydration of the present invention, dry all-in-one.
Five, embodiment:
In conjunction with the accompanying drawings, the invention will be further described:
Its technical scheme is: may further comprise the steps:
(1) acrylamide soln with high density is pressed in the all-in-one, open the refrigerated water terminal valve of chuck, attemperation makes internal temperature remain on 0 ℃-10 ℃, make feed liquid when low temperature, separate out crystal, by form observation feed liquid crystallization situation, and by the concentration of the acrylamide in the thief hole sampling detection solution, to determine the crystalline situation;
(2) after crystallization forms, open vacuum system and centrifugal device and by centrifugal and vacuum take-off the surplus solution in the equipment is extracted in the storage tank, recovery etc. are pending;
(3) after solution centrifugal suction residual in the equipment finishes, open the stirring ribbon of all-in-one, and open ribbon steam inlet valve and water of condensation valve, open hot water entrance's valve of the chuck of all-in-one bottom cone simultaneously, regulate the one built-in temperature and remain on 25 ℃-40 ℃, carry out drying, thereby obtain highly purified acrylamide crystal;
(4) crystal is after dry 3 hours, and the materials device of leaving soon of opening the cone bottom picks out qualified crystal, packs.
The method of using centrifugal, dehydration, dry three-in-one all-in-one to prepare acrylamide crystal needing in the traditional mode of production to have avoided many covering devices to finish production, floor space is big, the cost height, the mass transport difficulty, labour intensity is big, loss is big, and difficulty is bigger when requiring closed-loop operation for this deleterious material of acrylamide.
Centrifugal, dehydration among the present invention, the structure of dry all-in-one are as follows:
Engine housing is made up of top elipse head 1, middle part cylinder 2 and bottom cone 3, on cylinder and bottom cone, be provided with chuck, can heat or cool off material, drive unit drives tubular shaft 4 by chain gear and ribbon 5 rotates, the mechanical seal joint 6 of particular design is installed at the tubular shaft top, can make the circulation cmpletely in tubular shaft and ribbon of turnover heating agent, material is heated.In the cone of bottom, be provided with the complicated filtration unit of structure, have the no dead angle of particular design to leave materials device 7 soon in bottom of device.
Claims (2)
1, the method that centrifugal, the dehydration of a kind of usefulness, dry all-in-one are produced acrylamide crystal is characterized in that: may further comprise the steps:
(1) acrylamide soln with high density is pressed in the all-in-one, open the refrigerated water terminal valve of chuck, attemperation makes internal temperature remain on 0 ℃-10 ℃, make feed liquid when low temperature, separate out crystal, by form observation feed liquid crystallization situation, and by the concentration of the acrylamide in the thief hole sampling detection solution, to determine the crystalline situation;
(2) after crystallization forms, open vacuum system and centrifugal device and by centrifugal and vacuum take-off the surplus solution in the equipment is extracted in the storage tank, recovery etc. are pending;
(3) after solution centrifugal suction residual in the equipment finishes, open the stirring ribbon of all-in-one, and open ribbon steam inlet valve and water of condensation valve, open hot water entrance's valve of the chuck of all-in-one bottom cone simultaneously, regulate the one built-in temperature and remain on 25 ℃-40 ℃, carry out drying, thereby obtain highly purified acrylamide crystal;
2, the method that centrifugal, the dehydration of usefulness according to claim 1, dry all-in-one are produced acrylamide crystal is characterized in that: crystal is after dry 3 hours, and the materials device of leaving soon of opening the cone bottom picks out qualified crystal, packs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610070642 CN1974544A (en) | 2006-12-02 | 2006-12-02 | Process of producing acrylamide crystal in an integral centrifuging, dewatering and drying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610070642 CN1974544A (en) | 2006-12-02 | 2006-12-02 | Process of producing acrylamide crystal in an integral centrifuging, dewatering and drying machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1974544A true CN1974544A (en) | 2007-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610070642 Pending CN1974544A (en) | 2006-12-02 | 2006-12-02 | Process of producing acrylamide crystal in an integral centrifuging, dewatering and drying machine |
Country Status (1)
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| CN (1) | CN1974544A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114716322A (en) * | 2022-03-15 | 2022-07-08 | 安徽兴东化工有限公司 | Preparation process and system of 4,4' -methylene bis (2-methyl-6-ethyl aniline) |
-
2006
- 2006-12-02 CN CN 200610070642 patent/CN1974544A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114716322A (en) * | 2022-03-15 | 2022-07-08 | 安徽兴东化工有限公司 | Preparation process and system of 4,4' -methylene bis (2-methyl-6-ethyl aniline) |
| CN114716322B (en) * | 2022-03-15 | 2024-02-23 | 安徽兴东化工有限公司 | Preparation process and system of 4,4' -methylenebis (2-methyl-6-ethylaniline) |
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