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Technology for processing wastes generated in cyclohexyl isocyanate synthesis

A technology of waste treatment and synthesis process, which is applied in the preparation of isocyanic acid derivatives, purification/separation of isocyanic acid derivatives, and preparation of organic compounds, etc. It can solve problems such as environmental pollution, reduce production costs, and have strong practicability , the effect of improving economic efficiency

Inactive Publication Date: 2019-04-19
ANHUI GUANGXIN AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cyclohexyl isocyanate is directly synthesized by cyclohexylamine and phosgene. Cyclohexyl isocyanate is mainly used in insecticides, fungicides and herbicides. Due to the direct production of cyclohexyl isocyanate during the synthesis process Toxic acid gas and acid waste liquid, direct discharge without treatment will lead to environmental pollution, and the waste produced can be produced as by-products for sale. It is very necessary to recycle the waste produced from the synthesis of cyclohexyl isocyanate of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Pass the mixed gas containing phosgene and hydrogen chloride driven out from the synthesis tank into the lye absorption tower, spray the top of the absorption tower in the lye, and pass the bottom of the absorption tower in the mixed gas into the absorption tower , the temperature of the absorption tower is controlled at 5°C; when the volume of the lye accumulated at the bottom of the absorption tower is 1 / 3 of the volume of the absorption tower, the lye at the bottom of the absorption tower is transported to the top of the absorption tower for circulation spraying through the absorption circulation pump, when The volume of the lye accumulated at the bottom of the absorption tower is 2 / 3 of the volume of the absorption tower, and the lye is released from the bottom of the absorption tower; the obtained crude ester is transferred to the still, and the vacuum system of the still is opened to control the vacuum at -0.1MPa, control the temperature of the material inside the ...

Embodiment 2

[0024] Pass the mixed gas containing phosgene and hydrogen chloride driven out from the synthesis tank into the lye absorption tower, spray the top of the absorption tower in the lye, and pass the bottom of the absorption tower in the mixed gas into the absorption tower , the temperature of the absorption tower is controlled at 15°C; when the volume of the lye accumulated at the bottom of the absorption tower is 1 / 3 of the volume of the absorption tower, the lye at the bottom of the absorption tower is transported to the top of the absorption tower for circulation spraying through the absorption circulation pump, when The volume of the lye accumulated at the bottom of the absorption tower is 1 / 2 of the volume of the absorption tower, and the lye is discharged from the bottom of the absorption tower; the obtained crude ester is transferred to the still, and the vacuum system of the still is opened to control the vacuum at -0.15MPpa, control the temperature of the material inside...

Embodiment 3

[0028] Pass the mixed gas containing phosgene and hydrogen chloride driven out from the synthesis tank into the lye absorption tower, spray the top of the absorption tower in the lye, and pass the bottom of the absorption tower in the mixed gas into the absorption tower , the temperature of the absorption tower is controlled at 10°C; when the volume of the lye accumulated at the bottom of the absorption tower is 1 / 2 of the volume of the absorption tower, the lye at the bottom of the absorption tower is transported to the top of the absorption tower for circulation spraying through the absorption circulation pump, when The volume of the lye accumulated at the bottom of the absorption tower is 2 / 3 of the volume of the absorption tower, and the lye is released from the bottom of the absorption tower; the obtained crude ester is transferred to the still, and the vacuum system of the still is opened to control the vacuum at -0.1MPa, control the temperature of the material inside the...

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Abstract

The invention discloses a technology for processing wastes generated in cyclohexyl isocyanate synthesis. The technology comprises following steps: introducing discharged mixed gas into an alkali liquor absorbing tower, carrying out atomizing to absorb acidic gas, wherein the alkali liquor is atomized in cycle to absorb acidic gas and the absorption efficiency is improved; removing solvents from the obtained coarse esters, washing the coarse esters by an alkali and water, then extracting the washing liquor, allowing the extract to stand still to carry out layering; rectifying and separating obtained organic phase; adjusting the pH value of obtained water phase, and evaporating and crystallizing the water phase to obtain a byproduct. The waste gas generated in cyclohexyl isocyanate synthesisis absorbed by an alkali, the waste liquor is recovered and reutilized, the harmful substances will not enter the environment directly, the environment is protected, the useful materials are recovered, reutilized, or sold as a byproduct, the production cost is reduced, the economic benefits are increased, the production technology of cyclohexyl isocyanate is completed, the running of the cyclohexyl isocyanate synthesis technology is guaranteed, and the technology is very practical.

Description

technical field [0001] The invention relates to the technical field of organic chemical synthesis, in particular to a waste treatment process for synthesizing cyclohexyl isocyanate. Background technique [0002] The substance containing highly active free unsaturated isocyanate group (-NCO) in the molecule is called isocyanate. According to the number of free -NCO in the molecule, isocyanate can be divided into monoisocyanate R-NCO, diisocyanate OCN-R-NCO and 2 The above-NCO polyisocyanates. [0003] Cyclohexyl isocyanate is directly synthesized by cyclohexylamine and phosgene. Cyclohexyl isocyanate is mainly used in insecticides, fungicides and herbicides. Due to the direct synthesis of cyclohexyl isocyanate Toxic acid gas and acid waste liquid will cause environmental pollution if they are not treated and discharged directly, and the waste generated can be produced as by-products for sale. It is very necessary to recycle the waste generated from the synthesis of cyclohexy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C263/00C07C263/10C07C263/20C07C265/10
CPCC07C263/00C07C263/10C07C263/20C07C2601/14C07C265/10
Inventor 过学军黄显超徐小兵刘长庆朱张李红卫杨亚明李波吴建平操晶晶
Owner ANHUI GUANGXIN AGROCHEM
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