Document Type

Thesis

Date of Award

9-30-1958

Degree Name

Master of Science in Chemical Engineering - (M.S.)

Department

Chemical Engineering

First Advisor

George C. Keeffe

Second Advisor

Jerome J. Salamone

Third Advisor

C. L. Mantell

Abstract

The effect of agitation was studied on a 65-35 vinyl chloride-ethyl acrylate copolymer latex. Polymerizations were carried out in a 2 gallon stainless reactor with automatic control of jacket water temperature. Standard, "power calibrated" flat blade turbine impellers of 2 in., 3 in., and 4 in. diameter were used at speeds which provided an over-all range of impeller power from 0.00007 to 0.09 hp. Work on the technology of agitation, from the literature, used to characterize agitation with respect to the polymerization, was reviewed.

The investigation indicated that conversion, reaction rate, molecular weight and the stability of the emulsion were independent of the agitation system. The formation of resin agglomerates was strikingly affected by agitation, varying with impeller power, impeller size and the theoretical solids of polymerization. Particle size increased, just perceptibly, with increasing impeller power and polymerization solids. Batch foaming increased with increasing impeller power; heat transfer was facilitated by high levels of impeller power.

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