DE1110873B - Process for the chlorination of polyvinyl chloride without the use of solvents - Google Patents

Description

It is known that the properties of the vinyl chloride can be obtained by polymerizing the monomeric vinyl chloride Polyvinyl chloride by increasing its original chlorine content from about 54 to about 64% can be improved in various ways by subsequent chlorination. This post-chlorination takes place in all now known technical processes in suitable liquids and requires the isolation of the post-chlorinated product, its drying and cumbersome way in particular the recovery and processing of the liquids or solvents used. In this respect there has been no lack of attempts in connection with this post-chlorination to limit the great effort required for the individual phases of this process. It will therefore Process described to work while saving chemicals in suspension, and even finally as the main component water in addition to small amounts of organic liquids as a swelling agent in Proposal was brought. In the continuation of this basic simplification, the The use of liquids in this post-chlorination is dispensed with and the post-chlorination of polyvinyl chloride described in large-surface form at elevated temperature with gaseous chlorine. Thereafter, the temperature should be selected as high as possible and only by the sintering temperature of the Powder limited; d. That is, the reaction temperature is increased from 110 to 180 ° C.

In contrast to this information, it has now been found that the chlorine uptake of the polyvinyl chloride is around 110 ° C is still low, found that it is already considerable at room temperature; so it is not necessary Temperatures above 110 ° C should be selected. This is of considerable technical importance. Man Furthermore, the course of the chlorination at these lower temperatures by UV light can still be considerable accelerate.

example

In a rotating tube made of Jena device glass (diameter 55 mm, length of the route used 1100 mm, 3 revs / min., 3.8 ml chlorine / second) 1.0 kg process for chlorination

of polyvinyl chloride without use

of solvents

Applicant:

VEB paint factory Wolfen,
Wolfen (district of Bitterfeld)

Dr. Felix Seidel, Wolfen (district of Bitterfeld),
Walter Singer, Berlin-Treptow,

Hans Springer, Jeßnitz (district of Bitterfeld),

and Horst Heinrich, Greppin (Kr.Bitterfeld),

have been named as inventors

dry polyvinyl chloride fumigated with chlorine for 17.5 hours at 25 ° C and exposure to UV light. Without any externally noticeable changes, the original chlorine content is around 54 increased about 64%. After the end of the fumigation, the chlorine content of the product is at the point of entry of the chlorine 64.65 or 64.31% and at the point of exit of chlorine and hydrogen chloride 65.38 and 65.20%, respectively. If a temperature of 75 to 80 ° C is chosen for the same experiment, the chlorine content is of the product at the point of entry of the chlorine 66.63 or 66.75% and at the point of exit of Chlorine and hydrogen chloride 66.98 and 67.35%, respectively.

Claims (1)

PATENT CLAIM: Process for the chlorination of polyvinyl chloride in solid, large-surface form without the use of solvents by handling with gaseous chlorine, characterized in that chlorination is carried out at a temperature of below 100 ° C., optionally under the action of UV light.