摘要:
A gas treatment apparatus for treating a gas by bringing the gas into contact with a treatment liquid comprises: a gas-liquid contact chamber 55 for contacting the gas with the treatment liquid, a storage chamber 56 located over the gas-liquid contact chamber 55 for storing the treatment liquid, and a treatment liquid supplying means 57 for supplying the treatment liquid stored in the storage chamber 56 to the gas-liquid contact chamber 55 with a gravity-drop.
摘要:
A polyisocyanate production method comprises: (a) nitration of an aromatic raw material with H 2 SO 4 /HNO 3 ; (b) reduction of the nitro groups to produce a polyamine; (c) production of COCl 2 from CO and Cl 2 ; (d) reaction of the polyamine and the COCl 2 to produce a polyisocyanate and HCI; (e) oxidation of the HCI to produce Cl 2 and H 2 O; and (f) dehydration of the CL 2 /H 2 O using H 2 SO 4 , which is reused in step (a). The Cl 2 may be used in step (c).
摘要翻译:一种多异氰酸酯生产方法包括:(a)用H 2 SO 4 / HNO 3硝化芳族原料; (b)还原硝基以产生多胺; (c)由CO和Cl 2生产COCl; (d)多胺和COCl 2反应生成多异氰酸酯和HCl; (e)HCl的氧化以产生Cl 2和H 2 O; 和(f)使用在步骤(a)中重新使用的H 2 SO 4使CL 2 / H 2 O脱水。 步骤(c)中可以使用Cl2。
摘要:
A polyisocyanate production process uses the steps: (a) C1 2 + CO → COCl 2 ; (b) COCl 2 (from (a)) + polyamine → polyisocyanate + HCl; (c) HCl (from (b)) is oxidised to Cl 2 which is used in (a). In a start-up operation, the steps (a), (b) and (c) are started. In a load-up operation, the amount of product produced in one of the steps (a) to (c) is selectively increased, then the amounts produced in the other two steps are increased. This is repeated.