一种生成有机异氰酸酯标准大气的新方法。

A new method for the generation of standard atmospheres of organo isocyanates.

作者信息

Dharmarajan V, Rando R J

出版信息

Am Ind Hyg Assoc J. 1979 Oct;40(10):870-6. doi: 10.1080/15298667991430424.

Abstract

A new and versatile method for the generation of standard atmospheres of several organo isocyanates based on permeation technique has been developed. Several membranes were screened for integrity, compatibility and permeability of these isocyanates. Silicone membrane was found to be the best membrane for the construction of permeation devices. Two types of permeation are described: liquid phase and gas phase. The liquid phase permeation tubes are recommended for generation of high concentrations (ppm) and gas phase permeation is preferred for generation of atmospheres with low concentrations (ppb). Several simple designs for construction of permeation devices are described. The permeation of isocynates were evaluated gravimetrically and were shown to be constant, provided the temperature and the flow rate of air over the permeation tube are maintained constant.

摘要

基于渗透技术开发了一种用于生成多种有机异氰酸酯标准大气的新型通用方法。对几种膜进行了这些异氰酸酯的完整性、兼容性和渗透性筛选。发现硅氧烷膜是构建渗透装置的最佳膜。描述了两种类型的渗透：液相和气相。液相渗透管推荐用于生成高浓度（ppm），而气相渗透则更适合生成低浓度（ppb）的大气。描述了几种用于构建渗透装置的简单设计。通过重量法评估异氰酸酯的渗透情况，结果表明，只要保持渗透管上方空气的温度和流速恒定，渗透就是恒定的。