Method for producing 1,3-propylene glycol

A production method, the technology of propylene glycol, applied in the field 1, can solve the problems of low safety, difficulty in expanding production, long production cycle, etc., and achieve the effect of highlighting substantive features, facilitating investment in production, and expanding production scale

Inactive Publication Date: 2008-03-12
邹平铭兴化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The common method of producing 1,3 propanediol is formed by hydration of 1,2-propylene oxide. The defects of this production method are low product conversion rate, low product yield, poor control of the process, and low technical content. , the fixed investment is relatively large, which is not conducive to the promotion of production, the production operation is relatively dangerous, the safety is not great, it is not easy to expand production, the environment is seriously polluted, there are many three wastes, the production cycle is long, the yield is low, and the cost is high, etc.

Method used

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  • Method for producing 1,3-propylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 157.5kg of 1,3-bromochloropropane (100%, the same below), 164kg of sodium acetate (100%, the same below) and 0.315kg (100%, the same below) methanol into the reactor, mechanical stirring, steam Heating, when the temperature of the kettle rises to (130±2)°C, keep the temperature for about 2 hours, then continue to heat up, when the temperature of the kettle reaches (150±2)°C, reduce the steam flow, keep the temperature for about 6 hours, and then cool down to ( 40±2)°C, sampling and analysis.

[0031] After the reaction is over, start centrifugation, divide the solid-liquid mixture in the kettle into the centrifuge 5-6 times, the centrifuge speed can reach 1000 rpm, and turn on the centrifuge for about 15 minutes each time to completely separate the solid and liquid.

[0032] The centrifuged liquid phase is sucked into the rectification kettle by vacuum, and the rectification starts under the conditions of vacuum degree of -720mm Hg and oil bath temperature (190±5)°C...

Embodiment 2

[0035] Put 157.5kg of 1,3-bromochloropropane, 328kg of sodium acetate and 1.575kg of methanol into the reaction kettle, stir mechanically, and heat with steam. When the temperature of the kettle rises to (130±2)°C, keep the reaction for about 2 hours, and then continue to heat up , When the temperature of the kettle reaches (150±2)°C, reduce the steam flow rate, keep the temperature for about 6 hours, then lower the temperature to (40±2)°C, and take samples for analysis.

[0036] After the reaction is over, start centrifugation, divide the solid-liquid mixture in the kettle into the centrifuge 5-6 times, the centrifuge speed can reach 1000 rpm, and turn on the centrifuge for about 15 minutes each time to completely separate the solid and liquid.

[0037] The centrifuged liquid phase is sucked into the rectification kettle by vacuum, and the rectification starts under the conditions of vacuum degree of -720mm Hg and oil bath temperature (190±5)°C. When there is evaporation in th...

Embodiment 3

[0040] Put 157.5kg of 1,3-bromochloropropane, 246kg of sodium acetate and 0.788kg of methanol into the reaction kettle, stir it mechanically, and heat it with steam. When the temperature of the kettle rises to (130±2)°C, keep it warm for about 2 hours, and then continue heating Raise the temperature, when the temperature of the kettle reaches (150±2)°C, reduce the steam flow rate, keep the temperature for about 6 hours, then lower the temperature to (40±2)°C, and take samples for analysis.

[0041] After the reaction is over, start centrifugation, divide the solid-liquid mixture in the kettle into the centrifuge 5-6 times, the centrifuge speed can reach 1000 rpm, and turn on the centrifuge for about 15 minutes each time to completely separate the solid and liquid.

[0042] The centrifuged liquid phase is sucked into the rectification kettle by vacuum, and the rectification starts under the conditions of vacuum degree of -720mm Hg and oil bath temperature (190±5)°C. When there i...

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Abstract

The present invention belongs to the chemosyntheise field, which relates to a preparation method for 1,3 propylene glvcol; the method adopts two-steps reaction processes that are as follows: (1) 1,3 Fumazone is reacted with a sodium acetate in the alcohols catalyzer to create a di-esters (1,3 propyl ethyl ester); (2) the di-esters produced in Step 1 is reacted with a methanol alcohol in the resin catalyzer to create 1,3 propylene glvcol. The technical content for the technis process is much higher; the catalyzer can be used repeatedly. The conversion ratio for the material can reach up to or more than 94 percent and the purity for the product can reach up to or more than 99 percent; the investment for the fixed assets is much lower that is good for the investment product or enlarging the producing scale; the producing safety is much higher with convenient operation. The three materials in the present invention are easy to be obtained; the produced waste gas, waste liquid and waste residues are much less. The producing period is much shorter that only needs 60 hours from the material to the finished product.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to a production method of 1,3 propanediol. Background technique [0002] 1,3-Propanediol is one of the indispensable important raw materials for the synthesis of polyester fiber PTT. This project fills a large gap in the domestic polyester industry and promotes the development of the textile industry. It is called the PTT of large-scale fibers in the 21st century. Polyester and nylon fibers have more excellent performance. The clothes made of them are comfortable to wear, soft to the touch, easy to wash, quick-drying and non-ironing, which meet the requirements of the fast-paced life of people; at the same time, the stretch recovery and stain resistance of PTT are comparable to nylon It is comparable to nylon, and its bulkiness and elasticity, low static electricity, abrasion resistance and low water absorption are all better than nylon. Both filament and short fiber are suitable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/128C07C67/03
CPCY02P20/52
Inventor 李信
Owner 邹平铭兴化工有限公司
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