锂系溶聚丁苯橡胶连续聚合工艺的数学模拟

Mathematical simulation of continuous solution polymerization process for solution-polymerized styrene-butadiene rubber with lithium catalyst system

根据丁基锂引发苯乙烯-丁二烯连续聚合的动力学机理,建立了该聚合过程的多釜串联数学模型,对存在和不存在链转移的多釜串联连续溶液聚合工艺以及工业化生产用塔式反应釜进行了模拟,并对双釜不同返混量的塔式反应器进行了数学模拟。结果表明,模拟结果与模型试验得到的溶聚丁苯橡胶及国外产品的的相对分子质量及其分布比较吻合;双釜反应器的返混量越大,聚合产物的相对分子质量分布越宽,越接近单釜聚合产物的相对分子质量分布。

The mathematical model of continuous solution polymerization process of butadiene-styrene by in continuous stirring-tank reactors was established, according to dynamics mechanism of styrene-butadiene solution polymerization initiated with n-BuLi Continuous solution polymerization process with and without chain transfer, as well as tower reactor and tower double-reactor with different amount of back mixing were simulated. The results showed that relative molecular mass and its distribution of simulation solution- polymerized styrene-butadiene rubber（SSBR） was consistent with model test product and imported product. The bigger the amount of back mixing in double-reactor, the broader the distribution of relative molecular mass of SSBR product.