| 摘要 |
FIELD: chemistry.SUBSTANCE: described is a method of producing a highly purified disinfectant which contains polyhexamethylene guanidine hydrochloride, characterised by that flush water from production of polyhexamethylene guanidine hydrochloride in solid form is used. The flush water is mixed with 25% NaCl solution in ratio of 1:1 (polyhexamethylene guanidine hydrochloride solution with impurities: NaCl solution) while stirring constantly for 1 hour at temperature in the range of 50-60°C. Stirring is stopped and the mixture is cooled to 5°C, thereby dividing the mixture into two parts; the bottom part is drained, neutralised and sent for recycling and the top part containing up to 60-70% polyhexamethylene guanidine hydrochloride is further diluted to 50% with an aqueous solution of quaternary ammonium salts (QAS) to QAS concentration of not higher than 5%.EFFECT: extracting highly purified, concentrated high-molecular weight polyhexamethylene guanidine hydrochloride from flush water, reducing the amount and toxicity of waste water, improving disinfecting properties and increasing output of the commercial-grade product when producing polyhexamethylene guanidine hydrochloride in solid form, reducing cost.1 cl, 1 ex, 2 tbl |
