Uop Lcc

Union Carbide Corporation

Moez M Nagji

Ervine S Holmes

Desh R Garg

Jenny L Pai

John D Sherman

Robert E Trubac

Ronald J Ross

William C Miller

Keith R Clark

Joseph P Ausikaitis

Robert F Raymond

Bhadra S Grover

Olaf Nifontoff

This invention relates to a process for treating a feed gas stream containing CO.sub.2 and mercaptans by contacting the feed gas stream with a CO.sub.2 -selective adsorbent under conditions effective to produce a CO.sub.2 -depleted feed gas stream which is thereafter subjected to contact with an alkaline scrubbing solution under mercaptan absorption conditions effective to produce a mercaptan- and a CO.sub.2 -depleted product gas stream and a mercaptide-containing scrubbing solution. At least a portion of the product gas stream may be utilized to regenerate the CO.sub.2 -selective adsorbent and the mercaptide-containing scrubbing solution may be regenerated by contacting same with oxygen in the presence of an oxidation catalyst.

Process for the removal of carbon dioxide and mercaptans from a gas

The present invention relates to a new and integrated process involving the utilization of a primary adsorption bed containing a regenerable, physical adsorbent and an auxiliary sorption bed containing a chemisorbent for the removal of sulfur compounds from a fluid stream, which process provides for higher yields, higher purity and lower costs. A system for removing sulfur compounds in accordance with the above process is also disclosed.

Integrated process for the removal of sulfur compounds from fluid streams

A process for the removal of carbon dioxide, hydrogen sulfide and alkyl mercaptans from a hydrocarbon-containing feed gas:

Gas treatment process

In the production of methyl tert.-alkyl ethers by the reaction of methanol with isoalkylenes, the formation of dimethyl ether as an undesirable reaction by-product is reduced by recycling dimethyl ether to the reactor, advantageously in amounts sufficient to establish an equilibrium between the amount of dimethyl ether imparted to the reactor by way of recycle and the amount of dimethyl ether leaving the reactor as a portion of the reaction product whereby the formation of dimethyl ether in the reactor is essentially nil. In the present invention the essential recycle of dimethyl ether is accomplished by providing an adsorption capacity for dimethyl ether in the adsorption unit for recovering unreacted methanol and recycling dimethyl ether in combination with recycled methanol to the reactor as an effluent from the methanol adsorption unit during regeneration with isobutylene-containing C.sub.4 hydrocarbon feedstock.

Process for the production of methyl tert.-alkyl ethers

The present invention relates to a new and integrated process involving the utilization of a primary adsorption bed containing a regenerable, physical absorbent and an auxiliary sorption bed containing a chemisorbent and an optional physical absorbent for the removal of sulfur compounds and water from a fluid stream, which process provides for higher yields, higher purity and lower costs.

In the process for preparing methyl tert.-alkyl ether comprising the steps of (a) contacting and reacting in the liquid phase a reaction mixture formed by combining a stream consisting essentially of C.sub.4 -C.sub.5 hydrocarbons and containing at least some proportion of isoalkylene and a stoichiometric excess of methanol, with respect to the isoalkylene, to form a reaction product comprising methyl tert.-alkyl ether, unreacted methanol and unreacted C.sub.4 -C.sub.5 hydrocarbons; (b) isolating the methyl tert.-alkyl ether from the reaction product; and (c) recovering the unreacted methanol from the residual portion of the reaction product; the improvement which comprises selectively adsorbing the methanol constituent of said residual reaction product in a bed of crystalline molecular sieve adsorbent and recovering same by desorption using as a purge-desorption stream, the C.sub.4 -C.sub.5 hydrocarbon stream used to prepare the initial reaction mixture.

Process for preparing ethers

An improved liquid phase adsorption process is provided using a fixed bed system wherein the conventional post-regeneration bed-filling step and the post-adsorption bed-draining step are replaced by a displacement step. The bed volume of regeneration medium in a first bed of the system undergoing the final stage of regeneration cool-down is passed directly into a second bed of the system in the final stage of the adsorption step whereby the bed volume of void-space feedstock in said second bed is removed therefrom by displacement, thus effectively accomplishing in a single operation the filling step in the first bed and the draining step in the second bed.

Liquid phase adsorption process

A process for the removal of water and other polar compounds from an acidic stream containing water and at least one acid compound comprising contacting the acidic stream with an adsorbent comprising a chabazite-type zeolite wherein said adsorbent has a M.sub.2 O/Al.sub.2 O.sub.3 mole oxide ratio of at least 0.5 where 'M' is at least one cation selected from the group consisting of potassium, rubidium and cesium.

Growing community of inventors

Stamford, CT, United States of America

Moez M Nagji