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Hydrazine Salt Sodium Sulfate
Foshan Qiruide Additives Co., Ltd | Updated: May 31, 2017

A method for producing green process for hydration of hydrazine hydrate, hydrazine salt and Adc foaming agent.

The present invention relates to a new green cycle production process for hydrazine hydrate, hydrazine salt and ADC foaming agent, which is characterized in that a mixture of sodium sulfate or sodium carbonate or sodium sulfate and sodium carbonate is used in combination with chlorine, lime emulsion Reaction of sodium caustic acid produced by the reaction for the synthesis of hydrazine hydrate; in the low concentration of hydrazine hydrate solution of sodium chloride, sodium carbonate, sodium hydroxide, hydrazine hydrate and water were separated from each other, the use of multi-effect continuous evaporation, And the remaining unabsorbed water vapor is used as the heat source of the next-effect evaporator for secondary use. The hydrazine salt is continuously withdrawn from the packed tank at each stage. Evaporating and evaporating and concentrating the precipitated sodium chloride and sodium carbonate crystals by hydrochloric acid gravitational grading to obtain sodium chloride and sodium carbonate monohydrate; the hydrazine hydrate synthesis reaction solution is frozen and the by-produced sodium carbonate and one Sodium carbonate and chlorine, lime emulsion reaction to produce caustic hypochlorite, and then used for hydrazine hydrate synthesis reaction.

[Patent] A hydrazine hydrate, hydrazine salt and ADC foaming agent green cycle production of a new technology 【Technology】:

[0001] The present invention relates to a new process for green cycle production of hydrazine hydrate, hydrazine salt and ADC foaming agent, belonging to chemical technology [technical field].

Second, the background technology:

Hydrazine hydrate and hydrazine hydrate (including hydrazine hydrochloride and hydrazine sulfate) is an important chemical raw material, widely used in medicine, pesticides, plastic rubber foaming agent ADC production. At present, the main ripening hydrazine hydrate production process is ketone nitrogen process and urea sodium hypochlorite oxidation process, because the ketone nitrogen process for the production of one ton of hydrazine hydrate will produce 45 tons of waste water can not be environmentally friendly treatment, so our main hydrazine hydrate, hydrazine Salt and ADC foaming agent production process is based on urea sodium hypochlorite oxidation process, the process is as follows:

[0003] 1,80% of the content of hydrazine hydrate production process: sodium hypochlorite and urea, caustic soda reaction to get the content of 4% of the original hydrazine hydrate solution, the primary hydrazine hydrate solution frozen precipitation of sodium carbonate (precipitated water Sodium is only about 50% of the total amount of sodium carbonate produced by the reaction), and then the filtered hydrazine hydrate frozen mother liquor (the mother liquor also contains 13% to 16% sodium chloride, 4% to 6% sodium carbonate, 1% ~ 3% sodium hydroxide) by the "multi-effect distillation" and saline separation of hydrazine hydrate content of 80% of commercial hydrazine hydrate, sodium chloride and sodium carbonate; sodium carbonate and sodium carbonate Sodium and lime milk at a temperature of 90 ~ 100 ° C causticized to about 10% of the caustic soda, and then caustic caustic soda concentration increased to 22% and then react with chlorine to produce sodium hypochlorite, sodium hypochlorite recycling.

[0004] Chemical Reaction Equation:

[0005] 2Na0H + Cl2 - NaC10 + NaCl + H20

[0006] NaClO + (NH2) 2C0 + 2Na0H-N2H4.H20 + NaCl + Na2C03

Na2CO3 solution is frozen to crystallize a Na2CO3.IOH2O

[0008] 2, hydrazine sulfate production process: the sulfuric acid added to the I step to produce hydrazine hydrate frozen mother liquor for neutralization reaction to generate hydrazine sulfate solution, frozen mother liquor in the remaining sodium carbonate at the same time was neutralized into sodium sulfate per ton of sulfuric acid Hydrazine will be discharged from 12 to 15 tons containing 13% sodium chloride, 5% sodium sulfate, 0.1% ammonium salt, I% hydrazine salt wastewater, sulfuric acid hydrazine salt solution by freezing precipitation of crude hydrazine sulfate, crude hydrazine sulfate and then heavy Crystallization of finished hydrazine sulfate.

[0009] Chemical Reaction Equation:

[0010] N2H4.H20 + Na2C03 + 2H2S04 - Na2S04 + N2H4.H2S04 + C02 + 2H20

[0011] 3, ADC foaming agent (azodicarbonamide) production process: sulfuric acid or hydrochloric acid added to the step I hydrazine hydrate frozen mother liquor in the neutralization reaction to produce hydrazine salt solution, frozen mother liquor in the remaining sodium carbonate At the same time was neutralized into sodium sulfate or sodium chloride, and then urea added to the hydrazine salt solution for condensation reaction to produce insoluble in the water of the joint urine, filter to get the urine of urine, filter the mother liquor to the environment (per tonne Urine will be discharged from 10 to 12 tons containing 13% sodium chloride, 5% sodium sulfate, 4% ammonium salt, 1% hydrazine salt solution of the mother liquor), the joint urine and chlorine oxidation reaction (oxidant can be chlorine , Sodium chlorate or hydrogen peroxide) to give the ADC foaming agent (azodicarbonamide).

[0012] The above hydrazine hydrate, hydrazine salt and ADC production process energy consumption, high production costs, environmental pollution, poor competitiveness, I apply for a pre-hydrazine hydrate production of new technology patent technology is the use of [multi-effect Distillation of (that is, multi-effect evaporation, distillation) will be 4% of the hydrazine hydrate solution evaporation and concentration of hydrazine hydrate content of 40% to 80% of commercial hydrazine hydrate, the method is to evaporate the evaporator hydrated hydrazine hydrate Steam first into the distillation column for distillation, the distillation tower at the top of the steam and then as the next effective evaporator heating chamber heat source, so the formation of [multi-effect distillation], because the efficiency of the distillation tower need to tower back and tower Boiling heat, the efficiency of the distillation tower temperature, the pressure difference is greater, can not achieve more than three effects of the [multi-effect distillation], so the [multi-effect distillation] process to save the amount of steam is not.

【Rights request】

A process for producing green cycle of hydrazine hydrate, hydrazine salt and ADC foaming agent, characterized in that caustic acid is produced by the reaction of sodium sulfate or sodium carbonate or a mixture of sodium sulfate and sodium carbonate with chlorine and lime emulsion Sodium hypochlorite for synthesis of hydrazine hydrate; A, sodium sulfate used in the present invention may be sodium sulfate containing 10 crystal water to O crystal water or a mixture thereof or natural glauber's salt; B, sodium carbonate used in the present invention may be sodium carbonate And the mixture of sodium carbonate or sodium carbonate and lime milk in the production of caustic sodium hypochlorite. Causticized sodium hypochlorite, can also be the first lime milk to produce calcium hypochlorite and then sodium sulfate or sodium carbonate for metathesis decomposition of causticized sodium hypochlorite can also be in the process of lime milk through the same time by adding sodium sulfate or sodium carbonate Causticized sodium hypochlorite.