May 25, 2012 - UNION CARBIDE CHEMICALS COMPANY. Ind. Eng. Chem. , 1959, 51 (2), pp 18A–18A. DOI: 10.1021/i650590a711. Publication Date: ...
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Progress Report. . . — New di-tertiary amine — Propylene glycol — Gas sweetening

New chemical for you to explore Its name is long, so we'll mention it only once: N,N,N',N'-tetramethyl-l,3butaxediamine. CH, CH:,

as a solvent, humectant, and preserva­ tive. It is ideal for dissolving food fla­ vorings and colorings. In small quan­ tities, it helps packaged foods to retain their freshness and taste appeal.



CH,-CH-CH a -CH s -


Some of its physical properties are : Boiling point, 760 mmHg 165° C. Freezing point below -100° C. Solubility in water, 20° C. complete This di-tertiary amine is a colorless, stable liquid, soluble in common or­ ganic solvents. It has proved to be a highly active amine catalyst for polyurethane foams, with fast curing rate, and low odor level, producing soft foams. The new compound should be eval­ uated as a catalyst for epoxy resins. Its unique structure suggests applica­ tions in high energy fuels. You can get this new chemical from CARBIDE in 55-gallon drums in LCL or carload lots. Technical Information Bulletin F-40392 contains data on physical and physiological properties. For a copy, please check the coupon.

Double life of propylene glycol Propylene glycol, well known for its many important industrial applica­ tions, is also supplied by CARBIDE as "U.S.P. grade." The high purity of this product is important to formulators of medicinals and certain food prod­ ucts. Propylene glycol acts as a softening agent, spreader, and emollient for cos­ metics and salves. Many perfumes, dyes, and medicinal preparations are improved by the addition of propylene glycol to their formulas. It is often preferred as a hygroscopic agent, es­ pecially for maintaining the moisture content of tobacco products. Colorless, odorless, and tasteless, propylene glycol U.S.P. is fully misci­ ble with water and extensively used

A full description of properties and useful applications for propylene gly­ col and CARBIDE'S other glycols is found in the 60-page booklet, "Glycols." Get your copy by checking the coupon.

Tear out this coupon. Check the boxes on which you'd like more information, and mail to Dept. H, Union Carbide Chemicals Com­ pany, 30 East 42nd Street, New York 17. Ν. Υ. D Bulletin F-40392. α Glycols. α Gas Sweetening Bibliography. Name

Gas sweetening with ethanolamines


Natural gas has taken on greatly in­ creased economic value in the past decade because of its rapidly increas­ ing use as a fuel for both home and industry. As natural gases come out of the ground, however, some contain traces of corrosive acid gases such as hydrogen sulfide. Before the gas can be sent through long distance trans­ mission lines, the acid gases must be removed. Monoethanolamine reacts with weak acids such as hydrogen sulfide and carbonic acid to form unstable compounds. These decompose when heated, liberating the acid gases and freeing the monoethanolamine for re­ use. This provides an economic, con­ tinuous process for removing these undesirable materials from the gas stream. Because of this, substantially all gas sweetening in the United States is accomplished by the ethanolamines. In some plants, monoethanolamine is used along with diethylene glycol for simultaneous desulfurization and dehydration. Besides lowering the hy­ drogen sulfide content, this mixture also removes water vapor which might form hydrates and thus block trans­ mission lines.


Circle Nos. 78-1, 78-2, 78-3 on Readers' Service Card 18 A

Because Union Carbide Chemicals Company has long supplied monoeth­ anolamine to the natural gas industry, we are continually engaged in ex­ tensive research activities designed to improve gas treating processes. The re­ sults of this research are readily avail­ able to the industry through CARBIDE'S Technical Service Department. As a part of the service, a comprehensive bibliography of articles devoted to im­ proving gas sweetening operations is available. Compiled by CARBIDE, this publication lists all major articles that have been published on gas sweet­ ening and dehydration over a 25-year period. For a copy, check the coupon.


Company. Street Zone


And remember, there is a CARBIDE sales office near you where you can obtain the services of a CARBIDE Tech­ nical Bepresentative. His wide indus­ try experience is backed both by ex­ tensive chemical training and by Tech­ nical Specialists. "Union Carbide" is a registered trade-mark of Union Carbide Corporation.