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Process for improving product quality and yield of propanediol and glycol

A product quality, ethylene glycol technology, applied in the production of bulk chemicals, separation/purification of hydroxyl compounds, preparation of organic carbonates, etc., can solve the problems of poor quality and low yield, and achieve improved quality and simple production process , the effect of low energy consumption

Inactive Publication Date: 2008-04-09
北京格瑞华阳科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of low yield and poor quality of propylene glycol and ethylene glycol in the existing technology, the purpose of the patent of the invention is to provide a technology that can improve the yield and quality of propylene glycol and ethylene glycol. In addition to the production process Simple, low investment in production equipment, low energy consumption in the production process, it also has the advantages of high yield and good quality of propylene glycol and ethylene glycol

Method used

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  • Process for improving product quality and yield of propanediol and glycol

Examples

Experimental program
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Effect test

Embodiment 1

[0010] 1.293 tons of propylene carbonate, after reacting in the reaction distillation tower kettle, after the dimethyl carbonate product generated by the azeotropic method is taken away, 1.000 tons of mother liquor are obtained at the bottom of the tower kettle, wherein methanol content is 1.30%, propylene carbonate Content 0.30%, sodium methoxide content 2.00%, propylene glycol content 96.40%. Heat the mother liquor to 60°C-70°C, add 100 kg of deionized water and mix well. Pass through 1.5 kilograms of carbon dioxide, filter after reacting for 20 minutes. The filtrate was rectified under reduced pressure to obtain 852 kilograms of propylene glycol products, 100 kilograms of front cuts (containing 92% of propylene glycol), and 90 kilograms of propylene glycol products were obtained through circular vacuum rectification. The total yield of propylene glycol is 97.72%. Propylene glycol product quality analysis test results are as follows: propylene glycol content 99.82%, moistu...

Embodiment 2

[0012] In the reactive distillation tower still, use the same reactive distillation method as in Example 1 to obtain 1.000 tons of mother liquor with the same components as in Example 1 from 1.293 tons of propylene carbonate. Heat the mother liquor to 60°C-70°C, add 50 kg of deionized water and mix well. Feed 1.5 kilograms of carbon dioxide, filter after reacting for 20 minutes, obtain 835 kilograms of propylene glycol products by rectification under reduced pressure of the filtrate, 100 kilograms of front cuts (containing propylene glycol 90.6%), and 88.63 kilograms of propylene glycol products are obtained again through circular rectification under vacuum. The total yield of propylene glycol is 92.54%. Propylene glycol product quality analysis test results are as follows: propylene glycol content 99.80%, moisture 0.05%, chromaticity (platinum-cobalt colorimetric) <10#, heat stability test: 48 hours under 150 ℃, chromaticity (platinum-cobalt colorimetric) <30#.

Embodiment 3

[0014] In the reactive distillation tower still, use the same reactive distillation method as in Example 1 to obtain 1.000 tons of mother liquor with the same components as in Example 1 from 1.293 tons of propylene carbonate. Heat the mother liquor to 60°C-70°C, add 80 kg of deionized water and mix well. Feed 1.5 grams of carbon dioxide, filter after 20 minutes, and rectify the filtrate under reduced pressure to obtain 848 grams of propylene glycol, 100 grams of the front fraction (containing 92% of propylene glycol), and circulate the rectified under reduced pressure to obtain 90 kilograms of propylene glycol products again. EG yield was 97.00%. Propylene glycol product quality analysis test result is with embodiment 1.

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Abstract

A method of preparing pyruvaldehyde by propylene glycol in low temperature liquid phase oxidation highly selectively is characterized in that below 50 to 55 DEG C and in the acidic solvent, taking chromium trioxide as the oxidant and highly selectively oxidizing 1, 2-propylene glycol to pyruvaldehyde. The conversion of the 1, 2-propylene glycol is 100 percent, and the selection of preparing pyruvaldehyde is from 95.6 percent to 99.6 percent.

Description

1. Technical field [0001] This patent belongs to the technical field of fine chemicals, and relates to the process of synthesizing dimethyl carbonate through transesterification reaction between propylene carbonate and ethylene carbonate and methanol, and co-producing propylene glycol and ethylene glycol products. Ethylene glycol yield and quality process. 2. Background technology [0002] Propylene glycol (R=CH 3 , see the following reaction formula) and ethylene glycol (R=H) are not only important organic solvents, but also important synthetic intermediates of compounds such as medicines, dyes, and macromolecules, and their market prospects are promising. They can be respectively prepared by the transesterification reaction of propylene carbonate and ethylene carbonate with methanol, and the reaction formula is as follows: [0003] [0004] In addition to propylene glycol and ethylene glycol, there is also dimethyl carbonate in the product. Dimethyl carbonate is wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/74C07C69/96C07C68/06
CPCY02P20/52
Inventor 陈洁华屈强好王春菊
Owner 北京格瑞华阳科技发展有限公司
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