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1)  pre-separation & pre-distillation process
预分离-预蒸馏工艺
2)  predistillation ['pri:disti'leiʃən]
预蒸馏
3)  pre-distillator
预蒸馏塔
1.
Corrosion Cause analysis of pre-distillator in urea plant and countermeasures;
尿素系统预蒸馏塔的腐蚀分析及对策
4)  distillation separation
蒸馏分离
1.
The experimental conditions of the neutral titration method for determining the nitrogen content in (Ti(CN)) after wet process fusion in H_2SO_4+K_2S_2O_7 and distillation separation were investigated by orthogonal design optimization method, and the analytical method was developed.
采用正交设计优化法研究了硫酸+焦硫酸钾湿法熔融(化学法)分解碳氮化钛,以较少的实验次数确定了蒸馏分离和试样分解的最佳分析条件,通过条件实验,建立了相应的分析方法,测定结果与惰气熔融热导法一致。
5)  distillation pretreatment
蒸馏预处理
1.
The automatic control of determination of ammonia-nitrogen with the principle of Nessler s reagent colorimetry is described , moreover, distillation pretreatment device and pipeline control machinery with wriggle pump is designed.
论述了采用纳氏试剂光度法氨氮自动检测和控制系统的实现方法,设计了独特的蒸馏预处理装置和基于蠕动泵的液路控制系统,着重讨论了测试系统的硬件设计和以Codeworrior C交叉编译器为开发工具的软件设计。
6)  prefractionation ['pri:frækʃə'neiʃən]
预分馏
1.
A method of simulation and optimization of the prefractionation system was developed by calculation of the data gathering through varying the operation of a prefractionator in a benzeneplant.
以某制苯装置预分馏系统调优操作为背景,研究建立了预分馏系统的模拟优化方法。
补充资料:半预聚物工艺
分子式:
CAS号:

性质:又称半预聚物工艺。在用预聚法制备聚氨酯制品时,若聚合反应物料的异氰酸酯基同羟基的比例大于2,生成的预聚物两端为异氰酸酯基团,体系内保有一部分未反应的活性异氰酸酯,此体系称准预聚物,以这种准预聚物为基础进行扩链或聚合的工艺即准预聚物工艺。

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