T/AQB 61-2024 Glycopyrronium byproduct hypophosphoric solution

Scope

Scope: This document specifies the requirements, test methods, inspection rules, and marking, accompanying documents, packaging, transportation, and storage for glyphosate by-product phosphorous acid solution. This document applies to the quality control of by-product phosphorous acid solution generated during the reaction of methanol with phosphorus trichloride to produce dimethyl phosphate, hydrogen chloride, methyl chloride, and phosphorous acid. The bottom liquid of the distillation column is the by-product phosphorous acid solution, which is currently mainly used as a raw material for the production of industrial phosphorous acid. Through processes such as hydrolysis and filtration, it is possible to produce qualified products and industrial phosphorous acid meeting specifications. III. Main Technical Indicators 1. Chemical Composition · Phosphorous acid content: Not less than 70% to ensure the use and output of downstream enterprises. · Dimethyl phosphate content: Not more than 10% to reduce production costs while ensuring safe production. · Water content: Not more than 0.5% to ensure product stability and prevent lipids from hydrolyzing into flammable methanol during transportation and storage. 2. Stability · Under normal temperature and pressure, the main component phosphorous acid content shall not change by more than 1% within one year of storage. IV. Parameter Setting Basis 1. The setting of phosphorous acid content is based on the enterprise standards of several enterprises in the same industry and the detection results of downstream production enterprises. A content of 70% can meet the needs of industrial phosphorous acid production enterprises. 2. The setting of dimethyl phosphate content is limited by the safety production process parameters. Under the premise of ensuring safety and reducing consumption, the residual amount of dimethyl phosphate is controlled to the maximum extent. 3. The setting of water content is due to the fac

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