Ppg Industries, Inc.

Gordon A Carlson

Robert B Simmons

Howard H Hoekje

Joseph E Milam

Disclosure is a method of treating a chlorine containing first gas stream in an electrolytic cell having an aqueous hydrochloride acid catholyte liquor containing catholyte compartment, an aqueous hydrochloric acid anolyte liquor containing anolyte compartment and an ion permeable barrier therebetween. According to the disclosed method the first gas stream is fed to the catholyte compartment, and an electrical current is passed through the cell to form chloride ion in the catholyte liquor. The first gas stream, depleted in chlorine content, is recovered from the catholyte compartment, while a second gas stream, containing mainly chlorine is recovered from the anolyte compartment.

Sniff gas recovery method

Disclosed is a bipolar electrolyzer having a plurality of bipolar units space from and parallel to each other with a pair of bipolar units defining a single electrolytic cell therebetween. Each of the bipolar units has an anode on one surface and a cathode on the opposite surface, so that the cathode of one bipolar unit faces the anode of the next adjacent bipolar unit. A steel plate is one exposed surface of the backplate and a silicon sheet in electrical contact with the steel plate is the opposite exposed surface of the backplate. The steel plate and the silicon sheet are bonded together with a suitable electroconductive bonding material.

Bipolar electrolyzer having silicon laminate backplate

A process for the liquid phase nuclear chlorination of benzenes which uses a novel manganese chloride catalyst in an iron-free reaction environment. The manganese chloride catalyst provides a dichlorobenzene product having a higher ratio of orthodichlorobenzene to paradichlorobenzene than is obtained with conventional commercial liquid phase chlorination catalysts.

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Wadsworth, OH, United States of America

Gordon A Carlson