Production process of pigment red HT

A production process, pigment red technology, applied in the chemical industry, can solve problems such as low work efficiency and production quality, low catalytic activity of sodium tert-amylate, uneven pigment particles, etc., to achieve good batch stability and easy operation , the effect of fine particles

Active Publication Date: 2010-01-13
南通市埃唯卡新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The reaction needs to be heated and refluxed continuously for 24h to react completely, and the catalytic activity of the prepared sodium tert-amylate is not high, the whole preparation process takes a long time, and the work efficiency and production quality are not high
[0013] The miscibility of tert-amyl alcohol and water during the hydrolysis reaction makes the uniformity of the reaction poor, the obtained pigment particles are uneven, the transparency of the pigment is poor, and the color is not bright enough

Method used

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  • Production process of pigment red HT
  • Production process of pigment red HT
  • Production process of pigment red HT

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The production process of Pigment Red HT uses p-chlorobenzonitrile, diisopropyl succinate, sodium metal, methanol, and tert-amyl alcohol as basic raw materials. The steps are as follows: first, pour N into a 500L stainless steel melting pot 2 , and then after raising the temperature to 160°C, all 282 kg of sodium metal was added into the stainless steel melting pot. After the sodium metal was completely melted, N was introduced into the stainless steel sodium alkoxide preparation kettle. 2 , and keep the preparation kettle dry, then add 2127 kg of solvent tert-amyl alcohol solvent, stir and heat up to 101 ° C, then add molten sodium metal to the preparation kettle over a period of 0.4-0.6 hours, and control the stirring speed to 80 rpm / min, warming up to the reflux state, under the reflux state, gradually add dropwise 100ml concentration of 5% ferric trichloride tert-amyl alcohol solution, after the temperature reaches 119°C, start to feed N 2 , kept for 1h, at this ti...

Embodiment 2

[0036] First pass N into the 500L stainless steel melting pot 2 , and then raise the temperature to 150°C, add 260 kg of sodium metal into the stainless steel melting pot, and after the sodium metal is completely melted, pour N into the stainless steel sodium alkoxide preparation kettle. 2 , and keep the preparation kettle dry, then add 2080 kg of tert-amyl alcohol solvent, stir and heat up to 101-105°C, then add molten sodium metal into the preparation kettle over a period of 0.4-0.6h, and control the stirring speed to 80 Turn per minute, heat up to reflux state, under reflux state, gradually add dropwise 90ml of ferric trichloride tert-amyl alcohol solution with a mass concentration of 5% as a catalyst, after the temperature reaches 115-122°C, start to feed N 2, keep 1h to complete the oxidation-reduction reaction to obtain sodium tert-amylate;

[0037] In the 5000L condensation reactor, N 2 , then add 280 kg of solvent tert-amyl alcohol, heat up to 100-105°C, then cool do...

Embodiment 3

[0040] The production process of Pigment Red HT uses p-chlorobenzonitrile, diisopropyl succinate, sodium metal, methanol, and tert-amyl alcohol as basic raw materials. The steps are as follows: first, pour N into a stainless steel melting pot 2 , and then after raising the temperature to 180°C, all 300 kg of sodium metal was added into the stainless steel melting pot. After the sodium metal was completely melted, N was introduced into the stainless steel sodium alkoxide preparation kettle. 2 , and keep the preparation kettle dry, then add 2160 kg of tert-amyl alcohol solvent, stir and heat up to 101-105°C, then add molten sodium metal into the preparation kettle over a period of 0.4-0.6h, and control the stirring speed to 80 RPM, heat up to reflux state, under reflux state, gradually drop 110ml of ferric trichloride tert-amyl alcohol solution with a mass concentration of 5% as a catalyst, after the temperature reaches 115-122°C, start to feed N 2 , keep 1h to complete the oxid...

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Abstract

The invention relates to a production process of pigment red HT, comprising steps of redox reaction, condensation reaction and hydrolysis reaction. The redox reaction step is realized by gradually adding 90-110ml of ferric trichloride tert-amyl alcohol solution with a concentration of 5 percent as a catalyst, introducing N2 at a temperature of 115-122 DEG C, and maintaining redox reaction for one hour to obtain tert-amyl alcohol sodium; the hydrolysis reaction step is realized by adding 180-200kg of concentrated sulfuric acid with a mass concentration of 96 percent and hydrolyzing the concentrated sulfuric acid for 2-4 hours at a temperature of 40-60 DEG C, filtering, rinsing, drying and breaking to obtain the product. The invention has the advantages of short technique process, high efficiency and little side product; and the prepared pigment red HT has extremely fine particles and high transparency and is bright in color.

Description

technical field [0001] The invention relates to a production process of pigment red HT, a transparent variety of pigment red 254, which belongs to the field of chemical industry. Background technique [0002] Pigment Red HT, English name, pigment index number: C.I.Pigment Red 254, its structural formula is: [0003] [0004] The main physical and chemical properties are: [0005] Light resistance: grade 7-8 Heat resistance: 250℃ [0006] Acid resistance: grade 5 Alkali resistance: grade 5 [0007] Water resistance: Grade 5 Solvent resistance: Grade 5 [0008] Oil resistance: Grade 5 Water solubility: insoluble [0009] It is blue light red, bright color, high transparency, high tinting strength, strong weather resistance, [0010] Acid and alkali resistance, temperature resistance up to 250 ℃. It is mainly used in the coloring of industrial coatings, automotive coatings, plastics, etc. [0011] The hydroxyl group in tert-amyl alcohol is not very active in the prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B57/00C09B67/20
Inventor 赵觉新何勇恒任爱芬
Owner 南通市埃唯卡新材料有限公司
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