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Method for synthesizing high-stability thiourea dioxide

A technology of thiourea dioxide and high stability, which is applied in organic chemistry and other fields, can solve the problems of low product yield and poor thermal stability, and achieve the effect of high product yield, high thermal stability and improved safety performance

Inactive Publication Date: 2009-01-07
濮阳圣恺环保新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the influence of raw material ratio, control conditions, additives and other factors, the product yield is low and the thermal stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0007] Example 1: first add 600L of water to a 2000L reactor, add 3 kg of stabilizer (mass ratio of polyethylene glycol to tetrasodium hydroxyethylene diphosphonate is 1:1), stir evenly, and turn on the frozen brine pump to cool down; Mix 12kg of the accelerator (the mass ratio of potassium acetate to ammonium bicarbonate is 2:3) into 300kg of thiourea, mix well, and separate ten parts for use; when the temperature of the reaction kettle drops to 5--10°C, add Accelerator thiourea 31.2kg, after the thiourea is dissolved, slowly add 95kg of hydrogen peroxide, and the speed of adding hydrogen peroxide is controlled by the reaction temperature not exceeding 10°C; kg, after dissolving, slowly add 95kg of hydrogen peroxide dropwise, control the reaction temperature below 10°C, repeat this until the thiourea is finished, and use a total of 950kg of hydrogen peroxide; Put it into a centrifuge for centrifugal dehydration, and the separated solid product is sent to a vibrating bed dryer...

example 2

[0008] Example 2: First, add 600L of water to a 2000L reactor, add 6kg of a stabilizer (the mass ratio of polyethylene glycol to tetrasodium hydroxyethylene diphosphonate is 1:1), stir evenly, and turn on the frozen brine pump to cool down; Add 18 kg of accelerator (the mass ratio of potassium acetate to ammonium bicarbonate is 2:3) into 300 kg of thiourea, mix well, and separate ten parts for use; Accelerator thiourea 31.8kg, after the thiourea is dissolved, slowly add 100kg of hydrogen peroxide, the speed of adding hydrogen peroxide is controlled by the reaction temperature not exceeding 10°C; after 100kg of hydrogen peroxide drops, add thiourea 31.8 kg, after dissolving, slowly add 100kg of hydrogen peroxide dropwise, control the reaction temperature below 10°C, and repeat this until the end of thiourea, and use a total of 1000kg of hydrogen peroxide; Put it into a centrifuge for centrifugal dehydration. The separated solid product is sent to a vibrating bed dryer and dried...

example 3

[0009] Example 3: First, add 600 L of water to a 2000 L reactor, add 6 kg of a stabilizer (the mass ratio of polyethylene glycol to tetrasodium hydroxyethylene diphosphonate is 1:1), stir evenly, and turn on the frozen brine pump to cool down; Mix 15kg of the accelerator (the mass ratio of potassium acetate to ammonium bicarbonate is 2:3) into 300kg of thiourea, mix well, and separate ten portions for use; when the temperature of the reaction kettle drops to 5--10°C, add Accelerator thiourea 31.5kg, after the thiourea is dissolved, slowly add 98kg of hydrogen peroxide, the speed of adding hydrogen peroxide is controlled by the reaction temperature not exceeding 10°C; kg, after dissolving, slowly add 98kg of hydrogen peroxide dropwise, control the reaction temperature below 10°C, repeat this until the thiourea is finished, and use a total of 980kg of hydrogen peroxide; Put it into a centrifuge for centrifugal dehydration. The separated solid product is sent to a vibrating bed d...

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PUM

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Abstract

A manufacture method for synthesizing thiourea dioxide with high stability is the manufacturing method of a chemical product, which overcomes the disadvantages in other technologies and is confected by adopting the following raw materials: the molar ratio between thiourea and oxydol of 27.5 percent is 1:1.9 to 1:2.1; the mass ratio between polyethyleneglycol that is a stabilizing agent and hydroxyl ethidene diphosphonate tetrasodium is 1:1, and the quantity of polyethyleneglycol and hydroxyl ethidene diphosphonate tetrasodium can be 0.5 to 2.0 percent of the total quantity of thiourea; the mass ratio between postassium acetate that is an accelerant and ammonia bicarbonate is 2:3, and the quantity of postassium acetate and ammonia bicarbonate is 4.0 to 6.0 percent of the total auantity of thiourea. A method for preparing thiourea dioxide comprises the steps of confecting an accessory ingredient, catalysis synthesis, crystallization, dehydration, drying, and completing through packing. The main performance index of the product includes the aspects as follows: the main content of thiourea dioxide is more than or equals to 99.0 percent; residual thiourea is less than or equals to 0.1 percent, and sulphate is less than or equals to 0.17 percent; the iron content is less than or equals to 10ppm; the moisture content is less than or equals to 0.05 percent; the thermal stability is more than or equals to 55 minutes in water bath when the temperature is 95 DEG C. The manufacture method has the high yield of product and high thermal stability, effectively changes the product quality, and increases the safety performance of product transport and storage.

Description

1. Technical field: [0001] The invention relates to a production method of chemical products, in particular to a production method for synthesizing high-stability thiourea dioxide. 2. Background technology: [0002] Thiourea dioxide is a new type of reducing agent with strong reducing ability. It is widely used in the printing and dyeing industry to replace hydrosulfite. It is also widely used in wool and pulp bleaching, photography, organic synthesis, detergent and treatment of three wastes. At present, many domestic manufacturers adopt the water solvent method: that is, thiourea and hydrogen peroxide react and crystallize under low temperature conditions, and then filter and dry to obtain thiourea dioxide. Due to the influence of raw material ratio, control conditions, additives and other factors, the product yield is low and the thermal stability is poor. 3. Contents of the invention: [0003] The purpose of the present invention is to provide a kind of production meth...

Claims

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Application Information

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IPC IPC(8): C07C335/44
Inventor 陈志勇周星奎宋建德石敬法韩宝聚刘刚窦唯丽郭俊英
Owner 濮阳圣恺环保新材料科技股份有限公司
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