Device and method for producing trimethylene oxide by using electrolytic solution as saponification agent

A technology of propylene oxide and electrolyte, applied in the direction of organic chemistry, etc., can solve the problems of large amount of saponification waste residue, surrounding environmental pollution, inability to recycle waste water, etc., achieve low energy consumption, good permeability, and less steam consumption Effect

Active Publication Date: 2007-10-31
HANGJIN JINXI CHLOR-ALKALI CHEM CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] At present, calcium hydroxide solution, commonly known as milk of lime, is generally used as saponification agent in China. Some industrial enterprises that synthesize vinyl chloride by calcium carbide acetylene method use calcium carbide mud instead of part of milk of lime as saponification agent to reduce direct production costs. Milk of lime and calcium carbide mud are used. The characteristics of the saponification agent technology are that the raw materials are easy to obtain, the technology is simple, and the operation is convenient, but there is a large amount of saponification waste residue, and the saponification wastewater contains a large amount of calcium chloride, which makes it impossible to recycle these wastewater and cause serious pollution to the surrounding environment.

Method used

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  • Device and method for producing trimethylene oxide by using electrolytic solution as saponification agent
  • Device and method for producing trimethylene oxide by using electrolytic solution as saponification agent

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Embodiment 1

[0021] A device for producing propylene oxide using electrolyte as saponification agent, including chloropropanol storage tank 1, mixer 3, vacuum pump 4, saponification tower 6, condenser 8, crude propylene oxide storage tank 10, brine desalinator 11, flash Steam tank 13, electrolyte storage tank 18, chloropropanol storage tank 1 is connected with mixer 3 through chloropropanol pipeline 2; Mixer 3 is connected with saponification tower 6 through mixed liquid pipeline 16; Saponification tower 6 passes epoxy The propane vapor pipeline 7 is connected with the condenser 8, connected with the flash tank 13 through the saponification waste liquid pipeline 15 before flash evaporation, and connected with the flash tank 13 through the vapor recovery pipeline 14; the condenser 8 is connected with the crude propylene oxide pipe The road 9 is connected to the crude propylene oxide storage tank 10; the flash tank 13 is connected to the brine desalinator 11 through the saponified waste liqui...

Embodiment 2

[0029] Embodiment two is basically the same as embodiment one, the difference is:

[0030] (1) electrolyte concentration is controlled at 14WT%, and chloropropanol concentration is controlled at 5WT%, and the flow volume ratio of chloropropanol and electrolyte is 5: 1;

[0031] (2) saponification tower bottom temperature is controlled at 85 ℃;

[0032] (3) The top of the saponification tower is connected with a vacuum pump, so that the saponification tower is in a negative pressure state of 50KPa;

[0033] (4) The brine processor adopts low-temperature five-effect evaporation technology, the temperature of each effect is controlled at 60°C, 80°C, 100°C, 120°C, and 140°C, and the pure water treatment capacity is 220M 3 / H, concentrated brine treatment capacity is 220M 3 / H, the salt content of concentrated brine is 23WT%.

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Abstract

The invention discloses a device with electrolytic solution as saponifier to produce epoxypropane and method, which is characterized by the following: comprising chloropropyl alcohol reservoir, mixer, vacuum pump, saponifying tower, condenser, rough epoxypropane reservoir, saline water demineralization device, flash tank and electrolytic solution reservoir; connecting chloropropanol reservoir with mixer through chloropropanol conduit line; connecting the mixer to saponifying tower through miscible liquids line; connecting the saponifying tower to condenser through epoxypropane steam line; connecting the saponifying tower to the flash tank through saponification waste liquor line before flash distillation; connecting the saponifying tower to flash tank through steam line; connecting the condenser to rough epoxypropane reservoir through rough epoxypropane line; connecting the flash tank with saline water demineralization device through saponification waste liquor line after flash distillation; connecting the electrolytic solution reservoir to the mixer through electrolytic solution line. This invention possesses low energy consumption, which can be reclaimed as the raw material of caustic soda production.

Description

technical field [0001] The invention relates to a production device and method for chemical products, in particular to a device and method for producing propylene oxide using electrolyte solution as a saponification agent. Background technique [0002] In the production process of propylene oxide by chlorohydrin method, propylene and chlorine gas aqueous solution undergo chlorohydrinization reaction in the chlorohydrination reactor to generate chloropropanol solution, which is mixed with calcium hydroxide or sodium hydroxide aqueous solution and then enters the saponification tower. And through steam heating, saponification reaction generates crude propylene oxide, chloride and water, and the crude propylene oxide that flows out from the top of the tower is further rectified to obtain propylene oxide products. [0003] At present, calcium hydroxide solution, commonly known as milk of lime, is generally used as saponification agent in China. Some industrial enterprises that s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/26C07D303/04
Inventor 薛之化李春玉李井辉孙向明陈剑马宏李志新丛德继赵春跃李翠金垒刘鹏宋向前任艳丽李铁军
Owner HANGJIN JINXI CHLOR-ALKALI CHEM CO LTD
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