Method for preparing AC blowing agent

A technology of foaming agent and hydrazine hydrate, which is applied in the field of preparation of AC foaming agent, can solve the problems of large amount of waste water, etc., and achieve the effects of reducing electricity consumption, increasing economic benefits, and reducing acid consumption

Inactive Publication Date: 2006-07-19
薛式华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the large amount of waste water and serious environmental pollution defects in the existing AC foaming agent production method, and provide a production method of AC foaming agent, which can achieve without increasing environmental protection equ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. In the circulation tank, first prepare the sodium hydroxide with a concentration of 30% to a concentration of 16-18%, enter the packed tower from the upper part of the packed tower through the cooler, and then enter the packed tower from the lower part of the chlorine gas into the packed tower. Sodium oxide is absorbed, the reaction temperature is controlled to be less than 50°C, the pH value is continuously measured until the pH value is 11-12, and the chlorine gas valve is closed to obtain a solution containing 14-16% NaClO.

[0021] Add 1000kg of 14-16% NaClO solution to 500kg of 30% sodium hydroxide solution to prepare a solution containing 9-12% sodium hypochlorite and 10-12% sodium hydroxide solution in metering tank I, and then make 500kg of urea into a 24% solution In the metering tank II, the solutions in the two metering tanks are reacted in a 3000L reactor at a reaction temperature of 90-100°C, and the reactant is saline-containing alkali hydrazine hydrate ...

Embodiment 2

[0027] 1. In the circulation tank, first prepare the sodium hydroxide with a concentration of 30% to a concentration of 16-18%, enter the packed tower from the upper part of the packed tower through the cooler, and then enter the chlorine gas from the lower part of the packed tower, and the sodium hydroxide Absorption, control the reaction temperature to be less than 50°C, continuously measure the pH value until the pH value is 11-12, close the chlorine gas valve, and obtain a solution containing 14-16% NaClO.

[0028] Add 1000kg of 14-16% NaClO solution to 500kg of 30% sodium hydroxide solution to prepare a solution containing 9-12% sodium hypochlorite and 10-12% sodium hydroxide solution in metering tank I, and then make 500kg of urea into a 24% solution In the metering tank II, react the solutions in the two metering tanks in a 3000L reactor at a reaction temperature of 100-110°C, and the reactant is saline-containing alkali hydrazine hydrate with a concentration of about 5%...

Embodiment 3

[0034] 1. In the circulation tank, first prepare the sodium hydroxide with a concentration of 30% to a concentration of 16-18%, enter the packed tower from the upper part of the packed tower through the cooler, and then enter the packed tower from the lower part of the chlorine gas into the packed tower. Sodium oxide is absorbed, the reaction temperature is controlled to be less than 50°C, the pH value is continuously measured until the pH value is 11-12, and the chlorine gas valve is closed to obtain a solution containing 14-16% NaClO.

[0035] Add 1000kg of 14-16% NaClO solution to 500kg of 30% sodium hydroxide solution to prepare a solution containing 9-12% sodium hypochlorite and 10-12% sodium hydroxide solution in metering tank I, and then make 500kg of urea into a 24% solution In the metering tank II, the solutions in the two metering tanks are reacted in a 3000L reactor at a reaction temperature of 90-100°C, and the reactant is saline-containing alkali hydrazine hydrate ...

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PUM

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Abstract

The disclosed preparation method for AC foaming agent comprises: A. condensing and distilling directly the low-concentration hydrazine hydrate; B. preparing the high-concentration hydrazine hydrate; C. acidifying and condensing to prepare biurea; D. oxygenizing with Cl2 to obtain the target. This invention improves the method of freezing and removing Na2CO310H2O, decreases consumption of acid and powder, can recover the residue as byproduct to increase economic benefit, and reduces sewage discharge and tap water consumption.

Description

【Technical field】 [0001] The present invention relates to a kind of preparation method of AC blowing agent 【Background technique】 [0002] AC foaming agent, molecular formula: C 2 h 4 N 4 o 2 , Physical and chemical properties: Nitrogen yellow crystalline powder, extremely stable under normal conditions. Non-toxic, odorless, non-polluting. Soluble in dimethyl sulfoxide, dimethylamide and sodium hydroxide solution. Insoluble in acids, alcohols, ketones, benzene, gasoline and water. It is suitable for normal pressure or pressurized foaming processing of polyvinyl chloride, polyethylene, polypropylene, synthetic and natural rubber. [0003] The existing AC foaming agent production method is: first synthesize about 5% saline-containing alkali hydrazine hydrate with sodium hypochlorite, liquid caustic soda, and urea, then freeze and cool down to remove 10% sodium carbonate, and directly acidify and condense the salt-containing hydrazine hydrate to prepare biurea , After w...

Claims

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Application Information

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IPC IPC(8): C08K5/16C08J9/00
Inventor 薛式华
Owner 薛式华
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