Study on Inspection of Synthetic Reaction for Preparation of N-(phosphonomethyl) iminodiacetic Acid with Iminodiacetic Acid by Precolumn Derivatization-HPLC

The derivatives of the reaction liquid for synthesizing N-（phosphonomethyl） iminodiacetic acid （PMIDA） were synthesized with 9-fluorenyl methyl chlomformate （FMOC-C1） as the derivatization reagent. The separation of the derivatives was performed on a Gemini C18 column at room temperature by isocratic elution. The mobile phase was composed of 60% 0.05 M Nail2 PO4 （pH = 3.5） and 40% CH3 CN at a flow rate of 1 ml/min. The injection volume was 10 td, and the detection wavelength was 265 nm. The linear ranges of the derivatives of iminodiacetonitrile, iminodiacetic acid （IDA） and ammonia were, respectively, 0.02-1.2, 0.02-1.2 and 0.1 -2. 0 mg/ml with correlation coefficients not smaller than 0. 999 8. The detection limits for the derivatives were, respectively, 0. 000 4, 0. 000 4 and 0.003 mg/ml. The average recoveries of 3 derivatives were respectively 99.96%, 99. 86% and 99.89%, respectively, with relative standard deviation values not smaller than 1.6%. The method developed in the present paper could be used for monitoring the reaction system for preparation of PMIDA by IDA.

亚氨基二乙腈生产草甘膦中间体双甘膦降低能耗工艺条件改进

对以亚氨基二乙腈为起始原料,经碱解、缩合制备草甘膦中间体N-膦酰基甲基亚氨基二乙酸(简称双甘膦)工艺条件的优化试验,通过提高原料浓度,提高了亚氨基二乙酸一钠盐浓度,减少了缩合脱水时间,缩短了双甘膦生产周期,降低了能源消耗。

降低双甘膦生产能耗改进措施

通过对N-膦酰基甲基亚氨基二乙酸(简称双甘膦)生产中原材料规格的改进试验,降低了双甘膦生产中的脱水时间,达到了减少能源消耗、降低生产成本的目地。

草甘膦生产工艺优劣及双氧水氧化法环保达标分析

为进一步比较草甘膦生产工艺优劣,评价双氧水法生产草甘膦企业能否实现达标排放,技术人员对境内舒农农药种业有限公司草甘膦生产线生产工艺选择及其污染物产生、治理和排放情况开展深入细致的调查、监测和分析。结果显示:双氧水法生产草甘膦在水、气、声、固废方面环保均能通过环保验收,达标排放。该研究对草甘膦农药化工生产工艺的选择具有很强的针对性。

活性炭催化氧化双甘膦合成草甘膦工艺研究进展

概述了活性炭催化氧化双甘膦合成草甘膦的工艺现状。该工艺的氧化剂目前普遍采用的是含氧气体;催化剂主要有活性炭、负载贵金属和负载过渡金属的活性炭3种,工业生产中以前2种更为常见;该工艺的合成路线有间歇过程和连续过程,国内主要以间歇过程为主,国外已实现连续化生产。最后结合目前研究现状,指出日后的研究重点应着重在开发更优越的催化剂和合成路线2个方面。