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Preparation process of meta-cresol

A preparation process, the technology of cresol, applied in the field of m-cresol preparation process, can solve the problems of high cost, cumbersome process route, and difficult to solve raw materials, and achieve the effect of low cost, no three waste pollution, and stable price

Inactive Publication Date: 2004-07-28
唐师法
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Raw materials for crude distillation of tar are difficult to solve, the process route is cumbersome, and the cost is high

Method used

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  • Preparation process of meta-cresol
  • Preparation process of meta-cresol
  • Preparation process of meta-cresol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] A preparation process of m-cresol has the following technical process:

[0051] A. Salt

[0052] In the salt-forming pot with a cooling jacket, under stirring, first add 3100L of water, then slowly add 1000L of concentrated sulfuric acid, so that the temperature of the material liquid does not exceed 60°C, after the addition, cool down to below 40°C, and add 713Kg of methane Aniline reacts to form an aqueous solution of m-toluidine sulfate.

[0053]

[0054] B. Diazotization

[0055]In the diazotization pot with cooling device, add the m-toluidine sulfate solution in the salt-forming pot at one time, cool down to -5°C, and slowly add about 1200L of 40% sodium nitrite solution to make it react to form m-toluidine Aniline diazonium salt, until it turns blue with potassium iodide starch test paper, stop adding. If it is excessive, use sulfamic acid to remove excess sodium nitrite, and then add a certain amount of dilution water to complete the reaction.

[0056]

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Abstract

The present invention relates to a preparation process of chemical reagent, in particular, it is a preparation process of meta-cresol which can be used in the industries of pesticide, dyes, perfume, resin, plasticizer, film, chemical inhibitor and reagent, etc. Its technological process includes the steps of salt formation, diazotization, hydrolysis, neutralization and water-washing. It also provides its main raw material and auxiliary raw material which are easily available.

Description

technical field [0001] The invention relates to a preparation process of a chemical reagent, in particular to a preparation process of m-cresol which can be used in industries such as pesticides, dyes, spices, resins, plasticizers, film films, antioxidants and reagents. Background technique [0002] m-cresol, chemical name 3-hydroxytoluene, also known as m-cresol, methylphenol, hydroxytoluene, 1-hydroxy-3-toluene, m-distilled wood oleic acid, molecular formula C 7 h 8 O, is a colorless to pale yellow flammable liquid with phenol odor, soluble in about 40 times of water, soluble in caustic lye and common organic solvents. relative density (d 4 20 ) 1.034, melting point 11.5°C, boiling point 202.8°C, flash point 86.1°C, spontaneous ignition point 559°C, refractive index (n D 20 ) 1.5438. m-cresol can be used in industries such as pesticides, dyes, spices, resins, plasticizers, film, antioxidants and reagents. Mainly used in the production and manufacture of Sutianwei, F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/01C07C37/05C07C39/06
Inventor 唐师法
Owner 唐师法
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