Sulfuric Acid → 1,3-Butadiene

Participants

Reaction Conditions

Reaction Steps

Emulsified latex (mean particle diameter 0.1 μm, solid content 45%; viscosity 0.1 poise and density 1 g/cm3) which comprised 50% of butadiene component, 20% of styrene component and 30% of methyl methacrylate component was prepared by graft copolymeization of a styrene-butadiene copolymer with styrene and methyl methacrylate. This emulsified latex was discharged into a 0.2% aqueous sulfuric acid solution at 30° C. from fine tubes of 0.7 mm in inner diameter and 1 cm in length at a linear speed of 50 to 100 cm/sec. Reynolds number in the fine tube at this time was 35 to 70, the necessary run-up distance for laminar flow was 0.32 cm and the flow in the fine tube was sufficiently aligned to laminar flow. The emulsified latex discharged into the coagulation solution became soft aggregations of 400 to 700 μm surface of which was apparently coagulated. When surface skin of the soft aggregations taken out was broken by a needle tip, it was found that coalescent particles of 200 to 300 μm were present in the form of a coherent clump. The solution, as it was, was heated to 85° C. and left to stand for 10 minutes and the aggregations were filtered off, washed with water, dehydrated and dried to obtain a particulate.

Provenance & Evidence