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.
摘要:
A xylylenediisocyanate composition including xylylenediisocyanate and a compound represented by Chemical Formula (1) below, wherein 0.6 ppm or more and 60 ppm or less of the compound represented by Chemical Formula (1) below is contained:
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。