A kind of production method of 3-chloropropionic acid

A production method and technology of chloropropionic acid, which are applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate salts, etc., can solve problems such as uneconomical, corrosion of equipment by decomposing hydrogen chloride, loss of yield, etc. , to achieve the effect of increasing production

Active Publication Date: 2021-01-29
JINGCHU UNIV OF TECH
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Problems solved by technology

There are few patents for the synthesis of 3-chloropropionic acid by heating and hydrolyzing acrylonitrile and hydrogen chloride, see JP5821640, JP582164, because acrylonitrile itself is relatively expensive, and it is not economical to use it to synthesize 3-chloropropionic acid
[0004] The above four methods have all been used in the industrial production of 3-chloropropionic acid, but currently only the acrylic acid method is the most promising, so there are many reported patents, but these patented methods have limitations, because the addition of acrylic acid and hydrogen chloride is a long process , no matter what the temperature and pressure are, it will take a long time to complete the reaction, and in order to achieve complete reaction, it is not easy to achieve high purity without fractionation, and fractionation purification will lose yield, because 3-chloropropionic acid is Temperature sensitive, easy to dehydrochloride and return to acrylic acid, and the decomposition of hydrogen chloride will corrode the equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Assembly of continuous reactor:

[0029] Select 4 ordinary 1000L glass-lined reactors, and connect the 4 glass-lined reactors in series in 4 stages. There is a drop of 1 meter between the two directly connected glass-lined reactors, and the glass-lined reactor with the highest height from the ground is the first stage. Reactors, and then as the height of each glass-lined reactor and the ground decreases, they are respectively the second-stage reactor, the third-stage reactor and the fourth-stage reactor. The feed port of the glass-lined reactor is connected by a pipeline, and the gas outlet of each level of glass-lined reactor is connected with the air inlet of the next-stage glass-lined reactor by pipeline. After the assembly is completed, a continuous reactor is obtained;

[0030] 2, Preparation of 3-chloropropionic acid:

[0031] 2.1. First vacuumize the continuous reactor, replace it with nitrogen twice and discharge nitrogen, then vacuumize, start adding 720kg ...

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Abstract

The invention discloses a production method of 3-chloropropionic acid, comprising the following steps: 1. Assembly of a continuous reactor; 2. Preparation of 3-chloropropionic acid: 3. Purification of 3-chloropropionic acid; 4.3 ‑Sequential production of chloropropionic acid. The method is simple, convenient to operate, and has a high conversion rate of acrylic acid, and can obtain 3-chloropropionic acid with a purity higher than 99% without purification, and has low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to a production method of 3-chloropropionic acid. Background technique [0002] 3-Chloropropionic acid is a chemical raw material used in organic synthesis. It is mainly used in medicine, pesticides, etc. It can also be used to produce 3-mercaptopropionic acid, which is used in commercial concrete water reducers and as polymerization terminators. [0003] Regarding the synthesis of 3-chloropropionic acid, it was prepared by using propionolactone and chloride, hydrochloric acid or sulfuric acid in the early stage, see US2449987, GB635348; there is also the use of propionic acid chlorination to prepare 3-chloropropionic acid, see CN1349969. At present, acrylic acid and hydrochloric acid or hydrogen chloride are mainly used to produce 3-chloropropionic acid, see EP729935, US20120190879, CN1138569, SU1816756, CN1569799. As the price of acrylic acid drops, this rout...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/363C07C51/50C07C53/19B01J19/18
Inventor 胡莉萍吴瑞胡冠丰
Owner JINGCHU UNIV OF TECH
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