The Removal of Carbon-Sulphur Compounds from Coal 

 Gas by Washing the Gas with Oil (Abstract). — By K. 

 L. Dawson, B. Sc. (N. S. Tech.), A. M. E. I. C, Superin- 

 tendent, Gas Department, Nova Scotia Tramways & Power 

 Company, Limited, Halifax, Nova Scotia. 



(Presented 25 February, 1926) 



This address was built around so many lantern slides, 

 graphs and blackboard demonstrations that it is beyond the 

 scope of these proceedings to publish it in full. 



The speaker discussed the development of the equipment 

 now in use at Halifax for removing carbon sulphur compounds 

 from the city gas supply. Through the use of this equipment 

 it is possible to utilize about 6000 tons of Nova Scotian coal 

 per annum which could not be used otherwise for gas-making 

 because of Its high sulphur content, 1.5 to 2.5 per cent. In 

 addition he described the methods which were used to obtain an 

 explanation of the physical and chemical aspects of the process. 



Essentially the equipment exists in two parts, one to bring 

 the gas and the wash-oil into intimate contact over a large 

 surface for the purpose of permitting the transfer of sulphur 

 compounds from the gas to the oil, the other, to bring the used 

 oil into intimate contact with steam heating coils for the pur- 

 pose of preparing it for further use by distilling off the absorbed 

 sulphur compounds. 



Attempts to establish, by means of chemical analyses of 

 the gas and the oil at various points in the apparatus, the re- 

 lationship between the temperature surrounding the transfer of 

 the sulphur compounds from the gas to the oil and the quantity 

 of sulphur transferred, failed probably because of the extreme 

 smallness of the quantities to be determined. For instance, in 

 the case of the sulphur in the oil no method was located by which 

 the determination of one part in 60,000 could be made. 



By blackboard demonstration and graphs Mr. Dawson 

 showed how he developed a mathematical theory for establishing 

 this relationship. This method involves the use of three funda- 

 mental laws of physical chemistry, linked together by the proce- 

 dure of simple algebra, and the method of attacking problems 



