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Novel technology for chloral industrial production

A technology for the industrial production of chloral, applied in organic chemistry, separation/purification of carbonyl compounds, etc., can solve the problems of incomplete treatment, high cost of energy consumption, high treatment cost, etc., and achieve the effect of improving the utilization rate of raw materials

Inactive Publication Date: 2013-02-13
SHANDONG DACHENG AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two ways to solve this problem: generally, the azeotropic distillation dehydration process is used to replace the concentrated sulfuric acid dehydration process, and the price is high cost of energy consumption; another method is to use a stripping or extraction process to process the concentrated sulfuric acid This method has the problems of incomplete treatment and high processing cost

Method used

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  • Novel technology for chloral industrial production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Chlorine oil (containing 65% aldehyde, 6% hydrogen chloride) enters the chlorine oil preheater at a flow rate of 1000kg / h, and enters the bottom of the continuous extraction tower after being preheated to 50°C; the chloroform flow rate is controlled at 1000kg / h and enters the chloroform preheater After being preheated to 50°C, it enters the continuous extraction tower; after the two phases are fully mass-transferred in the tower, the water phase (18% dilute hydrochloric acid) overflows from the top of the tower, and the oil phase is discharged from the bottom of the tower into the intermediate tank.

[0021] The oil phase in the intermediate tank is pumped to the light removal tower with corrugated ceramic packing. The temperature of the tower bottom is controlled at 108°C and the temperature at the top of the tower is 61°C. A very small amount of water (6kg / h) is separated as dilute hydrochloric acid into the dilute hydrochloric acid storage tank. The liquid in the bot...

Embodiment 2

[0023] Chlorine oil (containing 64% aldehyde, 5.5% hydrogen chloride) enters the chlorine oil preheater at a flow rate of 1000kg / h, and enters the bottom of the continuous extraction tower after being preheated to 20°C; controls the flow rate of chloroform at 2000kg / h and enters the chloroform preheater After being preheated to 20°C, it enters the continuous extraction tower; after the two phases are fully mass-transferred in the tower, the water phase (17% dilute hydrochloric acid) overflows from the top of the tower, and the oil phase is discharged from the bottom of the tower into the intermediate tank.

[0024] The oil phase in the intermediate tank is pumped to the light removal tower with corrugated ceramic packing. The temperature of the tower bottom is controlled at 108°C and the temperature at the top of the tower is 61°C. A very small amount of water (6kg / h) is separated as dilute hydrochloric acid into the dilute hydrochloric acid storage tank. The liquid in the bot...

Embodiment 3

[0026] Chlorine oil (containing 64% aldehyde, 5.5% hydrogen chloride) enters the chlorine oil preheater at a flow rate of 1000kg / h, and enters the bottom of the continuous extraction tower after being preheated to 80°C; controls the flow rate of chloroform to 500kg / h and enters the chloroform preheater After being preheated to 80°C, it enters the continuous extraction tower; after the two phases are fully mass-transferred in the tower, the water phase (19% dilute hydrochloric acid) overflows from the top of the tower, and the oil phase is discharged from the bottom of the tower into the intermediate tank.

[0027] The oil phase in the intermediate tank is pumped to the light removal tower with corrugated ceramic packing. The temperature of the tower bottom is controlled at 108°C and the temperature at the top of the tower is 60°C. A very small amount of water (6kg / h) is separated as dilute hydrochloric acid into the dilute hydrochloric acid storage tank. The liquid in the bott...

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Abstract

The invention belongs to the field of chemical industry production technology, and relates to a novel technology for chloral industrial production. The chloro oil produced through the chlorination of technology-processed ethanol is extracted through organic solvent solution and separated into a diluted hydrochloric acid water phase and an organic phase, and the organic phase is used for producing high-content chloral through rectifying technology. As concentrated sulfuric acid is not used as dehydrating agent, waste sulfuric acid is prevented from being produced, the yield of chloral produced through the chloro oil amounts to more than 97%, and the components in the chloro oil as ethanol and hemiacetal are rectified and separated to return again to the chlorination reaction system, as a result, the utilization rate of raw material is further improved. The technology is environment-friendly, even though a small amount of organic solvent is consumed, a large amount of concentrated sulfuric acid is prevented from being used, and the steam consumption is barely increased, so that the product cost of the novel technology is the same as that of the existing technology.

Description

technical field [0001] The invention relates to a new industrial production process of trichloroacetaldehyde, which belongs to the field of chemical production process. Background technique [0002] Trichloroacetaldehyde is one of the halogen derivatives of important carbonyl compounds. It has a wide range of uses and can be used to produce various chemical products such as sodium trichloroacetate, chloral urea, hydrated chloral, and chloroform. Intermediates of organic pesticides such as dichlorvos and trichlorfon. [0003] At present, all domestic manufacturers adopt the ethanol chlorination process route. Water is added in the later stage of the chlorination reaction to convert the alcohol-hydrated chloral into crude chloral hydrate, commonly known as chlorine oil, which is then mixed with concentrated sulfuric acid and heated. Distillation, the chloral product is extracted in the gas phase, and the liquid phase is waste sulfuric acid, which needs to be harmlessly treate...

Claims

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Application Information

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IPC IPC(8): C07C47/16C07C45/78
Inventor 肖尚发李寿文李永刘海奇陈亮李晓竞王星乔霜
Owner SHANDONG DACHENG AGROCHEM
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