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Adsorbent and method for adsorbing and separating m-cresol and p-cresol by using adsorbent

An adsorption separation tower and adsorbent technology, applied in the chemical and petroleum fields, can solve the problems of inefficiency, environmental protection, and a large number of other problems, achieve good technical economy and practical application value, short process flow, reduce energy consumption and The effect of material consumption

Pending Publication Date: 2021-12-03
ZHEJIANG HUANHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such methods need to use a large amount of complexing agents, extractants, solvents, etc., which are not economical and environmentally friendly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]The mixed raw material of m-cresol and p-cresol with a molar ratio of 3:1 is sent into the vaporizer by a mass metering pump, and the temperature of the vaporizer is set to 220°C, and then the vaporized m-cresol and p-cresol gas into the shape-selective adsorption separation unit. The adsorption separation unit is pre-filled with a mesoporous ten-membered ring molecular sieve adsorbent modified by liquid-phase chemical silica deposition, in which the mesoporous ten-membered ring molecular sieve is a hydrogen type ZSM-5 molecular sieve, and the deposition amount of silicon dioxide is 12.7 wt%. The operating temperature of the adsorption tower in the shape-selective adsorption separation unit is set at 235°C, the inlet space velocity of the m-cresol and p-cresol mixture is WHSV 0.5h-1, and the condensation operating temperature of the material flowing out of the adsorption tower is 40°C. The condensed product is m-cresol, and the purity of m-cresol is greater than 99%. U...

Embodiment 2

[0029] The mixed raw material of m-cresol and p-cresol with a molar ratio of 4:1 is sent into the vaporizer by a mass metering pump, and the temperature of the vaporizer is set to 210°C, and then the gasified m-cresol and p-cresol gas into the shape-selective adsorption separation unit. The adsorption and separation unit is pre-filled with a mesoporous ten-membered ring molecular sieve adsorbent modified by liquid-phase chemical silica deposition, in which the mesoporous ten-membered ring molecular sieve is a hydrogen type ZSM-22 molecular sieve, and the amount of silica deposited It is 9.3wt%. The operating temperature of the adsorption tower in the shape-selective adsorption separation unit is set at 235°C, the inlet space velocity of m-cresol and p-cresol mixture is WHSV 1.0h-1, and the condensation operating temperature of the material flowing out of the adsorption tower is 40°C. The condensed product is m-cresol, and the purity of m-cresol is greater than 99%. Use gas c...

Embodiment 3

[0031] The mixed raw material of m-cresol and p-cresol with a molar ratio of 6:1 is sent into the vaporizer by a mass metering pump, and the temperature of the vaporizer is set to 210°C, and then the gasified m-cresol and p-cresol gas into the shape-selective adsorption separation unit. The adsorption and separation unit is pre-filled with a mesoporous ten-membered ring molecular sieve adsorbent modified by liquid-phase chemical silica deposition, in which the mesoporous ten-membered ring molecular sieve is a hydrogen type UZM-8 molecular sieve, and the amount of silica deposited It is 16.9 wt%. The operating temperature of the adsorption tower in the shape-selective adsorption separation unit is set at 235°C, the inlet space velocity of m-cresol and p-cresol mixture is WHSV 1.0h-1, and the condensation operating temperature of the material flowing out of the adsorption tower is 40°C. The condensed product is m-cresol, and the purity of m-cresol is greater than 99%. Use gas ...

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Abstract

The invention relates to an adsorbent and a method for adsorbing and separating m-cresol and p-cresol by using the adsorbent. The method for adsorbing and separating comprises the following steps: step 1, preheating and vaporizing a mixed material containing m-cresol and p-cresol, and introducing the preheated and vaporized mixed material into the adsorption separation tower unit filled with the adsorbent for gas phase pressure swing adsorption separation; step 2, condensing the material flowing out of the tower to obtain a m-cresol product with the content of more than 99wt%; step 3, stopping collecting materials flowing out of the tower when detecting that p-cresol begins to flow out, blowing off the materials in the adsorbent bed layer of the adsorption separation tower unit by adopting gas, condensing the blown-out materials, and circularly returning the condensed materials to the tower inlet as raw materials to be subjected to adsorption separation again; and step 4, performing negative pressure extraction on the adsorbent bed layer of the adsorption separation tower unit through a vacuum pump, and condensing the material obtained by extraction to obtain a high-purity p-cresol product with the content of more than 99wt%. The method has the characteristics of high separation efficiency and low adsorbent consumption, is short in process flow, and greatly reduces energy consumption and material consumption.

Description

technical field [0001] The invention relates to the fields of petroleum and chemical industry, in particular to an adsorbent and an adsorption separation method for m-cresol and p-cresol. Background technique [0002] m-cresol and p-cresol are very important chemical intermediates. m-cresol is mainly used as a pesticide intermediate to produce insecticides fenitrothion, fenthion, medicarb, permethrin, and also an intermediate of color film, resin, plasticizer and spice. p-cresol is mainly used in the synthesis of antioxidants, fluorescent whitening agents, pharmaceutical intermediates, dyes, pesticides and other fields. The traditional production methods for producing high-purity m-cresol and high-purity p-cresol are mainly m-toluidine diazotization hydrolysis method and sulfonation alkali fusion method. These two methods are complicated in process, and a large amount of high-polluting compounds such as diazonium salt, sulfuric acid, and sodium nitrite need to be used in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30B01D53/047C07C37/82C07C39/07
CPCC07C37/82B01J20/06B01J20/103B01J20/18B01D53/047C07C39/07
Inventor 朱志荣黄芳涛赵国庆李军辉李晓红
Owner ZHEJIANG HUANHUA TECH CO LTD