Method for producing acetone cyanhydrin and the subsequent products thereof by specific cooling
A technology of acetone cyanohydrin and acetone, applied in the directions of organic chemistry methods, chemical instruments and methods, amide preparation, etc.
Active Publication Date: 2008-06-25
ROHM G M B H
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Problems solved by technology
This is especially important when the prussic acid produced can be fed directly to a plant close to the acetone cyanohydrin plant because the plant for the production of hydrocyanic acid and the plant for the production of acetone cyanohydrin are located at the same site. Intermediate stages of metal cyanides are therefore defective
Method used
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[0178] In a reaction apparatus with loop reactor 26 corresponding to FIG. 8 , HCN and acetone were reacted at 10° C. in the presence of diethylamine as catalyst. The following table gives the reaction conditions.
[0179] Example
The body of the cooling zone 85
Product and Cooling Element 83
The ratio of the external volume of
heat exchanger 212
residence time
ACH's
Conversion rates
1.
1∶1.7
No flow resistance 213
0.2h
75％
2.
1∶1.7
Flow resistance 213
0.3
81％
3.
1∶0.7
No flow resistance 213
0.5h
83％
4.
1∶0.7
Flow resistance 213
0.6
87％
[0180] mark list
[0181] 1 equipment system
[0182] 2 Sulfuric acid conduit
[0183] 3 Other sulfuric acid conduits
[0184] 4 Used Sulphate Catheter-Ester
[0185] 5 Spent Sulfuric Conduit - Acid
[0186] 6 methacrylic ...
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The invention generally relates to a method for producing acetone cyanhydrin, comprising the following steps: contacting acetone and hydrocyanic acid in a reactor to give a reaction mixture, said reaction mixture being circulated and acetone cyanhydrin being obtained; cooling at least part of the reaction mixture by passing it through a cooling zone of a cooler, said cooler containing a cooling element or at least two cooling elements; separating off at least part of the produced acetone cyanhydrin from the reactor, the volume of the cooling zone of the cooler, based on the overall interior volume of the cooler, being larger than the volume of the cooling element or of the at least two cooling elements of the cooler. The invention also relates to a method for producing a methacrylic alkylester, to a method for producing methacrylic acid, to a device for producing methacrylic alkyl esters, to a method for producing polymers that are at least partially based on methacrylic alkyl esters, to the use of the methacrylic alkyl esters obtainable by the method according to the invention in chemical products, and to chemical products that are based on the methacrylic alkyl esters obtainable by the methods according to the invention.
Description
technical field [0001] In general, the present invention relates to a method for preparing acetone cyanohydrin, a method for preparing alkyl methacrylate, a method for preparing methacrylic acid, a device for preparing alkyl methacrylate , a process for preparing polymers based at least in part on alkyl methacrylates, the use of alkyl methacrylates obtained by the process of the invention in chemical products and based on the alkyl methacrylates obtained by the process of the invention chemical products. Background technique [0002] Acetone cyanohydrin is an important starting ingredient in the preparation of methacrylic acid and alkyl methacrylates. The two compounds described are monomers of great interest for a range of massen plastics, and due to the increasing use of these massen plastics there is an increasing demand for these monomers, so the starting product acetone cyanohydrin The demand is also increasing. Acetone cyanohydrin is obtained, for example, from hydr...
Claims
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IPC IPC(8): C07C253/00C07C255/16C07C67/20C07C69/54D01F6/16C08J5/18C08L33/08C09K8/035
CPCC07C231/06C07C231/14C07C67/20C07C51/06C07C253/00C07C57/04C07C69/54C07C233/09C07C255/16C07C253/30B01J19/18C07B61/00
Inventor U·格罗普R·韦伯T·舍费尔A·佩尔R·辛T·默茨
Owner ROHM G M B H