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Method for preparing solid acid catalyst

A technology of solid acid catalyst and molecular sieve, which is applied in the preparation of organic compounds, preparation of amino compounds, chemical instruments and methods, etc., can solve the problems of high production cost and large amount of sewage, so as to reduce production cost, reduce the amount of sewage, and select good sex effect

Inactive Publication Date: 2010-06-23
INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of large amount of sewage and high production cost in the existing production of 4,4'-diaminodiphenylmethane, and provide a method for preparing a solid acid catalyst

Method used

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  • Method for preparing solid acid catalyst
  • Method for preparing solid acid catalyst

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specific Embodiment approach 1

[0010] Specific embodiment 1: The steps of the preparation method of the solid acid catalyst in this embodiment are as follows: 1. Ammonization of the molecular sieve: dry the molecular sieve at 120-200° C. for 1-5 hours, and then put the dried molecular sieve into a concentration of 0.5- In 2mol / L ammonium chloride solution, react at 80-100°C for 1.5-3h, then wash with water at 60-100°C until there is no chloride ion, and then dry at 100-150°C for 12-24h to obtain Ammonium-type molecular sieve; 2. Roasting: Roast ammonium-type molecular sieve at 400-600°C for 2-4 hours to obtain hydrogen-type molecular sieve; Aluminum, wherein the degree of dealumination reaches 2-80% (weight), to obtain dealuminated molecular sieve; 4. Impregnation: the dealuminated molecular sieve is impregnated in the impregnation solution for 0.1-4h by equal volume impregnation method or vacuum impregnation method; 5. Hydrothermal treatment The method comprises: carrying out hydrothermal treatment on the ...

specific Embodiment approach 2

[0015] Embodiment 2: This embodiment differs from Embodiment 1 in that the molecular sieve in step 1 is X-type molecular sieve, Y-type molecular sieve, ZSM-12 molecular sieve or β-type molecular sieve. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment is different from Embodiment 1 in that the calcination temperature in step 2 is 550°C. Others are the same as in the first embodiment.

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Abstract

A preparation method for a solid acid catalyst relates to a preparation method for a catalyst. The invention solves the problems of large sewage quantity generated in the existing process for manufacturing DDM and high manufacture cost. The solid acid catalyst of the invention takes a molecular sieve as a carrier, the carrier is subject to ammoniation, baking, re-dealuminzation or ammoniation, damp absorption and re-chemical liquid phase deposition, then is dipped in phosphor and boron for modifying, and finally undergoes hydro-thermal treatment. The solid acid catalyst of the invention can be repeatedly used and has good selectivity to DDM. The sewage quantity generated is greatly reduced when the product of the invention is used for catalyzing the reaction that aniline reacts with formaldehyde to generate 4,4'-diaminodiphenyl methane. As the chemical raw materials like muriatic acid and sodium hydroxide are not added in the reaction process, the manufacture cost is reduced and the yield of DDM reaches over 70 percent.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a solid acid catalyst for producing 4,4'-diaminodiphenylmethane. Background technique [0002] 4,4'-Diaminodiphenylmethane (DDM) is a widely used medium temperature curing agent, especially for the curing of epoxy resin. Polyimide resins, insulating varnishes, polyimide resins, bima resins, etc. prepared using diaminodiphenylmethane have excellent mechanical properties, insulation properties, high temperature resistance, radiation resistance and wear resistance. At present, most domestic and foreign industrial devices use aniline and formaldehyde as raw materials, hydrochloric acid catalyzed synthesis route, after the reaction, the crude product of DDM can only be obtained through alkali washing and water washing. When producing 4,4'-DDM, amine-containing and salt-containing waste water greater than 10 times the product amount will be produced. At th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/18C07C209/78C07C211/50
Inventor 白雪峰李猛崔宝军耿庆生
Owner INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI
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