CN104250451A - Preparation method of Metanil yellow G - Google Patents

Abstract

A preparation method of Metanil yellow G comprises the steps of a diazotization reaction, a coupling reaction, roller drying, crushing and mixing packaging. The method can effectively reduce the output of byproducts in the production process in order to improve the output and the quality of a product and effectively protect environment.

Description

A kind of making method of Methanil Yellow G

(1) technical field

The present invention relates to a kind of substantive dyestuff production technique, particularly relate to a kind of making method of Methanil Yellow G.

(2) background technology

At present, Methanil Yellow G is one of main golden dye species, is mainly used in staining agent, acid base indicator, for the dyeing of the painted of soap and silk, wool, paper, leather etc.But in the production process of Methanil Yellow G, existing technique seed output and quality of product when producing is not high, the generation causing byproduct in building-up process rises, and these byproducts can reduce the quality of product simultaneously also can to environment.This making method of inventing the Methanil Yellow G related to effectively can reduce the generation of byproduct in process of production, thus improves the seed output and quality of product, makes environment obtain effective protection simultaneously.Also do not find the appearance of like product in the market, correlation technique data also finds no open.

(3) summary of the invention

The object of the invention is the weak point in order to overcome existing substantive dyestuff production technique, and provide a kind of making method of Methanil Yellow G.

Technical scheme of the present invention realizes like this.

The making method of a kind of Methanil Yellow G of this programme, concrete making step is as follows:

(1) diazotization reaction

Gauge water is added in diazotization reaction still, then quantitative m-sulfanilic acid is added, stir and become uniform suspended substance in 1 hour, hydrochloric acid quantitatively adds in reactor through scale tank, add appropriate ice and be cooled to 0 ~ 10 DEG C, Sodium Nitrite solid and water are joined stirring and dissolving in dissolving vessel, the sodium nitrite solution after dissolving adds in reactor, stirring action 1 hour, reaction equation is as follows:

(2) coupled reaction

The diazo liquid of aforementioned preparation is added in coupling tank, add 20 DEG C of pentanoic emulsion, act on to pH=1 ~ 2, regulate pH=4.3 ~ 4.5 with soda ash solution, keep 10 ~ 15 DEG C until diazonium thing disappears, diazonium thing stirring action 30 minutes again after disappearing, generates dyestuff Methanil Yellow G, regulates pH=8 ~ 8.5 with soda ash solution, by volume 23% adds refined salt and saltouts, stir 1 little up to profit circle clear, for subsequent use, reaction equation is as follows:

(3) roller drying

By the dyestuff slurries of preparation by Cemented filling to the material fluid bath of roller dryer, carry out roller drying with indirect steam, dried tail gas introduces spray absorber purifying treatment by blower fan, and cleaning of off-gas is by 1 15 meters of aiutages discharge;

(4) pulverize

Dried dyestuff drops into pulverizer and pulverizes rear for subsequent use, and the dust that crushing process produces is collected by cloth bag, and tail gas is by 1 15 meters of aiutages discharge;

(5) mixture packaging

The dyestuff crushed is dropped into mixture tank, adds Sodium sulfate anhydrous.min(99) and dust laying oil mixture according to each chromaticity index, the finished product obtained is by bottom drain hole pack packaging.In order to control the uncontrollable discharge produced in wrapping process, at mixture tank discharge port, blower unit being installed and the dust produced in blowing wrapping process is introduced sack cleaner.

Usefulness of the present invention is: the present invention effectively can reduce the generation of byproduct in process of production, thus improves the seed output and quality of product, makes environment obtain effective protection simultaneously.

(4) embodiment

Below in conjunction with embodiment, the invention will be further described.

The making method of a kind of Methanil Yellow G of embodiment, concrete making step is as follows:

(1) diazotization reaction

Gauge water is added in diazotization reaction still, then quantitative m-sulfanilic acid is added, stir and become uniform suspended substance in 1 hour, hydrochloric acid quantitatively adds in reactor through scale tank, add appropriate ice and be cooled to 5 DEG C, Sodium Nitrite solid and water are joined stirring and dissolving in dissolving vessel, and the sodium nitrite solution after dissolving adds in reactor, stirring action 1 hour.

(2) coupled reaction

The diazo liquid of aforementioned preparation is added in coupling tank, add 20 DEG C of pentanoic emulsion, effect, to pH=1.5, regulates pH=4.3 with soda ash solution, keeps 13 DEG C until diazonium thing disappears, diazonium thing stirring action 30 minutes again after disappearing, generate dyestuff Methanil Yellow G, regulate pH=8.2 with soda ash solution, by volume 23% adds refined salt and saltouts, stir 1 little up to profit circle clear, for subsequent use.

(3) roller drying

By the dyestuff slurries of preparation by Cemented filling to the material fluid bath of roller dryer, carry out roller drying with indirect steam, dried tail gas introduces spray absorber purifying treatment by blower fan, and cleaning of off-gas is by 1 15 meters of aiutages discharge;

(4) pulverize

Dried dyestuff drops into pulverizer and pulverizes rear for subsequent use, and the dust that crushing process produces is collected by cloth bag, and tail gas is by 1 15 meters of aiutages discharge;

(5) mixture packaging

The dyestuff crushed is dropped into mixture tank, adds Sodium sulfate anhydrous.min(99) and dust laying oil mixture according to each chromaticity index, the finished product obtained is by bottom drain hole pack packaging.In order to control the uncontrollable discharge produced in wrapping process, at mixture tank discharge port, blower unit being installed and the dust produced in blowing wrapping process is introduced sack cleaner.

Above one embodiment of the present of invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.

Claims (1)

1. a making method for Methanil Yellow G, is characterized in that:

Concrete making step is as follows:

(1) diazotization reaction

Gauge water is added in diazotization reaction still, then quantitative m-sulfanilic acid is added, stir and become uniform suspended substance in 1 hour, hydrochloric acid quantitatively adds in reactor through scale tank, add appropriate ice and be cooled to 0 ~ 10 DEG C, Sodium Nitrite solid and water are joined stirring and dissolving in dissolving vessel, the sodium nitrite solution after dissolving adds in reactor, stirring action 1 hour, reaction equation is as follows:

(2) coupled reaction

The diazo liquid of aforementioned preparation is added in coupling tank, add 20 DEG C of pentanoic emulsion, act on to pH=1 ~ 2, regulate pH=4.3 ~ 4.5 with soda ash solution, keep 10 ~ 15 DEG C until diazonium thing disappears, diazonium thing stirring action 30 minutes again after disappearing, generates dyestuff Methanil Yellow G, regulates pH=8 ~ 8.5 with soda ash solution, by volume 23% adds refined salt and saltouts, stir 1 little up to profit circle clear, for subsequent use, reaction equation is as follows:

(3) roller drying

By the dyestuff slurries of preparation by Cemented filling to the material fluid bath of roller dryer, carry out roller drying with indirect steam, dried tail gas introduces spray absorber purifying treatment by blower fan, and cleaning of off-gas is by 1 15 meters of aiutages discharge;

(4) pulverize

Dried dyestuff drops into pulverizer and pulverizes rear for subsequent use, and the dust that crushing process produces is collected by cloth bag, and tail gas is by 1 15 meters of aiutages discharge;

(5) mixture packaging

The dyestuff crushed is dropped into mixture tank, adds Sodium sulfate anhydrous.min(99) and dust laying oil mixture according to each chromaticity index, the finished product obtained is by bottom drain hole pack packaging.In order to control the uncontrollable discharge produced in wrapping process, at mixture tank discharge port, blower unit being installed and the dust produced in blowing wrapping process is introduced sack cleaner.