Ppg Industries, Inc.

Ppg Industries Ohio, Inc.

J Douglas Mansell

Tommy G Taylor

Mark E Woodyear

John P Shamburger

Harlan B Johnson

Thomas G Krivak

Laurence E Jones

Dennis W Carson

W Eugene Wimer

Robert K Pertuit

Fred C Trager

Angel L Siso

Leo C Comeaux

James H Boyette

Jonn E Fike, Jr

J Boyd Alleman

Robert E Feathers

1,1,1-Trichloroethane (viz., methylchloroform) and 1,1,2-trichloroethane are produced in the same reactor by feeding molecular chlorine and chloroethene (viz., vinyl chloride) as well as 1,1-dichloroethane to the reactor. The ratios at which the two trichloroethanes are produced can be easily controlled by controlling the relative ratios of 1,1-dichloroethane and chloroethene introduced to the reactor. The reactions are conducted in the liquid phase in the presence of free radical initiator.

Concurrent production of trichloroethane isomers

Perchloroethylene containing contaminating amounts of dichlorobutadiene is treated with bromine, e.g., elemental bromine, in the presence of a free-radical initiator, thereby to produce perchloroethylene substantially-free of dichlorobutadiene and without significant loss of perchloroethylene. A bromine scavenger, e.g., trichloroethylene, can be added to the treated perchloroethylene to react with excess bromine that may be present in the perchloroethylene.

Method for purifying perchloroethylene containing dichlorobutadiene

A process for liquifying a substance comprises: (a) transferring latent heat from the substance in the gaseous state to a first heat transfer fluid passing through a first loop wherein the first heat transfer fluid is substantially isolated from the substance and is unreactive with the substance; (b) transferring heat from the first heat transfer fluid to a second heat transfer fluid passing through a second loop wherein the second heat transfer fluid is substantially isolated from the substance and from the first heat transfer fluid; and (c) transferring heat from the second heat transfer fluid to a third heat transfer fluid wherein the third heat transfer fluid is substantially isolated from the substance, from the first heat transfer fluid, and from the second heat transfer fluid. The preferred substance is molecular chlorine.

Liquefaction of chlorine or other substances

Benzene or a chlorinated benzene feedstock compound represented by the formula C.sub.6 H.sub.6-x Cl.sub.x is chlorinated in the rectifying zone of a catalytic distillation reactor to produce a chlorinated benzene product compound represented by the formula C.sub.6 H.sub.5-x Cl.sub.x+1, where x is an integer in the range of from 0 to 5.

Chlorinated benzenes

Corrosion inhibiting calcium-containing amorphous precipitated silica is described. The silica is prepared by admixing simultaneously in a reactor aqueous alkali metal silicate, e.g., sodium silicate, acidifying agent, e.g., hydrochloric acid, and a water-soluble source of calcium, e.g., calcium chloride. The product contains from 6 to 9 weight percent calcium (as CaO). The silica product may be incorporated into a coating composition used for corrodible metallic surfaces.

Article having a corrosion inhibiting coating

Corrosion inhibiting pigment

A gaseous feed stream comprising hydrogen fluoride and 1,1-difluoroethane is contacted with liquid organic barrier material in a condensing zone to partially condense the feed stream. The gaseous phase remaining after the partial condensation comprises most of the 1,1-difluoroethane originally present in the feed stream while the liquid condensate comprises most of the hydrogen fluoride originally present in the feed stream. The gaseous phase and the liquid condensate are removed from the condensing zone as separate streams. Less than about 50 percent of the 1,1-difluoroethane originally present in the feed stream reacts with hydrogen fluoride to form 1,1,1-trifluoroethane during the partial condensation and the removal of the separate streams from the condensing zone. The preferred liquid organic barrier material is 1,1,-trifluoroethane.

Separation of hydrogen fluoride from 1,1-difluoroethene

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Sulphur, LA, United States of America

J Douglas Mansell