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Method for reducing moisture content of byproduct S-epoxy propane in production of R-propylene carbonate

A technology of propylene carbonate and propylene oxide, applied in the direction of organic chemistry, can solve the problems of unfavorable energy saving and emission reduction, high production cost, high energy consumption, etc., and achieve the effects of easy control, low cost and low energy consumption

Inactive Publication Date: 2018-07-13
WEIFANG HUITAO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The traditional method to reduce the water content of S-propylene oxide, a by-product of R-propylene carbonate production, is the high-tray distillation separation method, which requires large investment, high energy consumption, and high production costs, which is not conducive to energy saving and emission reduction.

Method used

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  • Method for reducing moisture content of byproduct S-epoxy propane in production of R-propylene carbonate
  • Method for reducing moisture content of byproduct S-epoxy propane in production of R-propylene carbonate
  • Method for reducing moisture content of byproduct S-epoxy propane in production of R-propylene carbonate

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1 A kind of method that reduces R-propylene carbonate production by-product S-propylene oxide moisture content

[0026] Add 50kg of caustic soda (sodium hydroxide) to a 5000L glass-lined still with agitation, add 3000kg of R-propylene carbonate production by-product S-propylene oxide before treatment, and add at a rate of 200kg / min at one time. Turn on the stirring, the stirring speed is 85r / min, stir for 60 minutes, then distill with 50-65°C circulating hot water, the circulating hot water flow rate is 200kg / min, the heating time is 30-50 minutes, the fraction recovered by cooling is to reduce the moisture content of the by-product S-propylene oxide.

[0027] The moisture content of the by-product S-propylene oxide before treatment: 1.02%, and the moisture content of the by-product S-propylene oxide after treatment: 0.24%, which meets the customer’s S-propylene oxide quality standard.

[0028] The mass ratio of caustic soda: S-propylene oxide is 1.67:100. ...

Embodiment 2

[0030] Embodiment 2 A kind of method that reduces R-propylene carbonate production by-product S-propylene oxide moisture content

[0031] Add 75kg of caustic soda (sodium hydroxide) to a 5000L glass-lined still with agitation, add 3000kg of R-propylene carbonate production by-product S-propylene oxide before treatment, and add at a rate of 200kg / min at one time. Turn on the stirring, the stirring speed is 85r / min, stir for 90 minutes, then distill with 50-65℃ circulating hot water, the circulating hot water flow rate is 200kg / min, the heating time is 30-50 minutes, the fraction recovered by cooling is to reduce the moisture content of the by-product S-propylene oxide.

[0032] The moisture content of the by-product S-propylene oxide before treatment: 1.52%, and the moisture content of the by-product S-propylene oxide after treatment: 0.34%, which meets the customer’s S-propylene oxide quality standard.

[0033] The mass ratio of caustic soda: S-propylene oxide is 2.50:100.

...

Embodiment 3

[0035] Embodiment 3 A kind of method that reduces R-propylene carbonate production by-product S-propylene oxide moisture content

[0036] Add 21kg of caustic soda (sodium hydroxide) to a 5000L glass-lined still with agitation, add 3000kg of R-propylene carbonate production by-product S-propylene oxide before treatment, and add at a rate of 200kg / min at one time. Turn on the stirring, the stirring speed is 85r / min, stir for 30 minutes, then distill with 50-65°C circulating hot water, the circulating hot water flow rate is 200kg / min, the heating time is 30-50 minutes, the fraction recovered by cooling is to reduce the moisture content of the by-product S-propylene oxide.

[0037] The moisture content of the by-product S-propylene oxide before treatment: 0.61%, and the moisture content of the by-product S-propylene oxide after treatment: 0.29%, which meets the customer’s S-propylene oxide quality standard.

[0038] The mass ratio of caustic soda: S-propylene oxide is 0.70:100. ...

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Abstract

The invention provides a method for reducing the moisture content of byproduct S-epoxy propane in production of R-propylene carbonate. The method comprises the following steps: adding caustic soda flakes into a distillation kettle; adding the byproduct S-epoxy propane in the production of the R-propylene carbonate; starting and stirring; then distilling and cooling and recycling a fraction, i.e.,the byproduct S-epoxy propane with the reduced moisture content. According to the method provided by the invention, the moisture content of the byproduct S-epoxy propane in the production of the R-propylene carbonate is reduced to 0.24 to 0.34 percent and the product appearance keeps clear; compared with other methods for reducing moisture through high-tower-plate distillation, distillation afterwater absorption of anhydrous calcium chloride, silica gel and SAP (Super Absorbent Polymer) resin and the like, the method has the characteristics of low equipment investment, small dosage, good effect, low cost, easiness for washing, low energy consumption, easiness for controlling, stability in production, environment friendliness and the like and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for reducing the water content of S-propylene oxide, a by-product of R-propylene carbonate production, and belongs to the field of fine chemicals. Background technique [0002] The raw material for producing R-propylene carbonate is R-propylene glycol and dimethyl carbonate precipitation preparation, and the preparation of raw material R-propylene glycol is to generate raw material R-propylene glycol and by-product S-propylene oxide through the splitting of propylene oxide low-temperature catalytic hydrolysis, and then Separated by distillation. [0003] By-product S-propylene oxide production mechanism: [0004] [0005] Since the by-product S-propylene oxide is generated by splitting propylene oxide through low-temperature catalytic hydrolysis, the by-product S-propylene oxide is separated from R-propylene glycol by distillation after splitting, and some water is distilled together to the by-product S-propylene o...

Claims

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Application Information

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IPC IPC(8): C07D301/32C07D303/04
CPCC07D301/32C07D303/04
Inventor 刘剑伟丁翔
Owner WEIFANG HUITAO CHEM
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