四百六十章 路线变更(1 / 1)

“GMP只考虑质量,不考虑其它,这些理由审计员不会釆信。”小蔡的回复如当头一棒,把王近之一天的辛苦全给否定了。

怎么样才能使工艺变更与质量改进挂钩呢?王近之想了又想,铁泥会吸附还原液,含湿率高,会引起碘化投料比的不准确,从而引起质量波动。于是,重编了文件对小蔡说:“这个理由总说得通了吧,我再打几张图谱作依据,说明两者之间操作稳定性有差异。”

这一关总算过去了,补充材料由林利勇送抵国家局,两周以后,2008年4月23日,碘海醇厂区搬迁补充申请获得国家局批准,誓太灵公司可以在新厂区正式生产和销售碘海醇。

与此同时,研发楼实验室正式启用,开发部与药分部搬迁到新厂区,新中试车间开始安装。

吴总召集开发部人员讨论碘帕醇路线的变更,说:“采购三碘异酞酰氯进行碘帕醇的合成成本太高,是否可以模拟碘普罗胺的路线先进行羟基保护,再上侧链,最后水解脱保护基再树脂分离呢?”

资料报道的路线前半部分碘帕醇碘化物的合成与碘海醇碘化物极其类似,只是用丝氨醇替代了氨基甘油,其它加氢与碘化都一样,制得碘化物后,资料报道羟基保护与上乙酰氧基丙酰基都是以DMAC为溶剂的,DMAC是与水互溶的偶极非质子溶剂,并含有氨基,这么多的溶剂进入水中,氨氮指标太高,废水池根本无法生化。王近之想到了教课书介绍的另一种偶极非质子溶剂六甲基磷酰三胺,可以与卤代烃络合后与水分层,这么做的话能够轻松地对溶剂进行回去,不对环境造成很大的影响,并且它的沸点高达230多度,不容易被真空拉走,价格也不高,基本上与DMAC同一档次。有这么理想的溶剂,还不釆购一包装桶试一试?吴总当即批准小试方案,并签出采购单。

丝氨醇与酯化物的反应开始了,操作比氨基甘油与酯化物反应更简单,甲醇溶液中两种主原料在回流的条件下就缓慢地释出,回流六小时,点板发现已无酯化物,冷却析晶过滤,即得到高纯度的碘帕醇交换物。

加氢条件也平和,常温搅拌溶于水后,60℃下通氢气,控制氢气压力在0.6MPa以下,七小时后不再吸氢,保压一小时,取样分析,结果原料已完全反应,加入配制好的氯化碘,65~70℃条件下反应,可以看到碘化物缓慢析出,保温过夜后过滤烘干,即可得到碘帕醇碘化物,本步反应摩尔收率92%,达到了预期。

到了决定产品有否产业化价值的最关键操作,用六甲基磷酰三胺替代DMAC进行羟基保护及与乙酰氧基乙酰氯进行反应的操作了,想象中可能会比较困难的反应,实际上却出乎意料的顺风顺水,条件与DMAC完全相同,中控转化率与质量更是十分满意。

从赵定岳处拿到液相图谱,陈骨良与顾斌文一路小跑来到王近之的办公室,喘着气说:“我们成功了,反应液里碘帕醇主峰就达到了99.6%,只有乙酰基杂质略超过成品的指标。

“先别高兴得太早了,反应结果一开始就在我们的意料之中,本产品的成败是能否顺利的,高收率的回收溶剂,从而解决环境污染的难题,这个数据还没开始收集呢。

另外,丝氨醇价格比氨基甘油高好几倍,而碘帕醇的销售价又低于碘海醇,利润空间小,树脂分离收率一低,说不定我们又卡在成本关上,无法产业化。”王近之给他俩泼了盆冷水。

这是大实话,打通工艺到成本过关有一大段的路程要走,陈骨良又叫上张准锦,四人细细商量了如何从反应液中回收六甲基磷酰三胺的小试方案。

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