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Method for clean and stable storage of cyanohydrin products

A technology of cyanohydrin and products, which is applied in the field of clean and stable storage of cyanohydrin products, can solve the problems of undifferentiated storage time and waste of resources, and achieve the effects of reducing the impact of impurities, saving resources, and reducing waste

Active Publication Date: 2019-04-23
LUFENG TIANBAO PHOSPHORUS CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] (2) Adding more hydrocyanic acid increases operational risk and subsequent side reactions;
[0021] (3) Stabilizing operation without distinguishing between storage duration and different requirements, resulting in waste of resources

Method used

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  • Method for clean and stable storage of cyanohydrin products
  • Method for clean and stable storage of cyanohydrin products
  • Method for clean and stable storage of cyanohydrin products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation of embodiment 1 catalyst

[0045] Take 3.5Kg H-type carboxylic acid-based domestically produced D113 macroporous ion exchange resin (if it is Na-type resin, it needs to be soaked in dilute acid solution to convert to hydrogen-type), rinse with a small amount of water to remove possible soluble impurities, add 2 Double the volume of industrial desalted water and swell for 30~60min. After swelling, remove floating mechanical impurities or broken resin, pour out excess water until the resin is just wet, and adjust to pH=4 with 2~10% sodium hydroxide or potassium hydroxide solution ~7 and keep it for 10~40min, then transfer the prepared catalyst directly into the packed tower or keep it moist and sealed for later use.

Embodiment 2

[0046] Embodiment 2 raw material pretreatment

[0047] The crude hydrogen cyanide gas from the hydrogen cyanide synthesis workshop is processed by two-stage absorption and deamination with 10~98% sulfuric acid, and the composition of crude hydrogen cyanide gas is as follows: hydrogen cyanide gas 9.4%±2%, hydrogen gas 1.6%± 1%, nitrogen 79.4%±2%, oxygen 1.7%±1%, carbon monoxide 5.8%±2%, carbon dioxide 1.5%±1%, methane 0.6%±0.5%, water vapor 3.7%±2%;

[0048] The 3-methylthiopropanal raw material from the 3-methylthiopropanal (MMP) synthesis unit is mixed with 5-8% water by mass in a static mixer to obtain a water-dispersed emulsion;

Embodiment 3

[0049] Example 3 Synthesis of 2-hydroxyl-4-methylthiobutyronitrile for the first time

[0050] Turn on the heat exchanger of the packed tower, and control the temperature inside the tower at 25-80° C. The tower is loaded with the carboxylic acid-based polymer resin buffer salt catalyst prepared in Example 1.

[0051] The crude hydrogen cyanide gas from the deammonization Angle method of embodiment 2 enters from the bottom of the packed tower, and the gas velocity is 2 ~ 15L / min; The top enters, the flow rate is 1~10L / min, the two react countercurrently in the packed tower, and the crude cyanohydrin containing 1~8% MMP is obtained at the bottom of the reaction tower, and the crude cyanohydrin is pumped to the top of the tower by the circulating pump at the bottom of the packed tower At the circulation port, the whole tower is circulated to continue the reaction until MMP is completely converted into cyanohydrin (MMP residue is less than 0.5%).

[0052] After the initial feed i...

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PUM

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Abstract

The invention discloses a method for clean and stable storage of cyanohydrin products. A recyclable heterogeneous stabilizer substitutes a traditional inorganic acid to serve as a cyanohydrin stabilizer. According to short, medium and long term different storage duration requirements, the content of moisture and hydrocyanic acid components in cyanohydrin and impurity removal are selectively adjusted to reduce unnecessary stabilization process operations and waste of hydrocyanic acids, the stabilizer and the like serving as stable resources as far as possible while stable storage of cyanohydrinin required storage duration is realized. By use of the heterogeneous stabilizer, cyanohydrin contamination caused by inorganic acid can be avoided, recyclability is realized, and cleanness and energy saving in storage of the cyanohydrin products are achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for cleanly and stably storing cyanohydrin products. Background technique [0002] Cyanohydrin, that is, α-hydroxynitrile (also known as cyanohydrin), is often used as a synthetic intermediate and widely used in the synthesis of products in the fields of medicine, pesticide, feed and polymer materials. For example, the simplest hydroxyacetonitrile can be used to synthesize the high-efficiency insecticide cypermethrin, and can further prepare iminodiacetic acid for rubber and broad-spectrum herbicide glyphosate; acetone cyanohydrin can be used to synthesize high-molecular organic compounds. Monomer methyl methacrylate (MMA) of glass (PMMA); 2-hydroxy-4-methylthiobutyronitrile is an important intermediate for the synthesis of D, L-methionine (MET) and D, L-hydroxymethionine (MHB) Aromatic cyanohydrins and their transformations are mostly important pe...

Claims

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Application Information

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IPC IPC(8): C07C253/32C07C255/16C07C255/17C07C319/26C07C323/60
CPCC07C253/32C07C319/26C07C255/16C07C255/17C07C323/60
Inventor 周荣超廖常福彭启明
Owner LUFENG TIANBAO PHOSPHORUS CHEM CO LTD
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