We have relaunched our website! Please go to https://www.bcinsight.crugroup.com/ to get a Free Trial or Subscribe to our magazines. If you are subscriber, please login to the new website to get your news, content, and downloadable copies of your magazine.
Summary
Good acid distribution in any tower is extremely critical to ensure optimum tower performance and maximum service life of downstream equipment. Nick Bhambri of Monsanto Enviro-Chem presents the advantages of alloy trough distributors which have been designed to proved complete coverage over the entire tower packing surface.Abstract
Good acid distribution in any tower is extremely critical to ensure optimum tower performance and maximum service life of downstream equipment. Nick Bhambri of Monsanto Enviro-Chem presents the advantages of alloy trough distributors which have been designed to proved complete coverage over the entire tower packing surface.
Good acid distribution in any tower is extremely critical to ensure optimum tower performance and maximum service life of downstream equipment. In this age of heightened environmental awareness and fiscal responsibility, the choice of acid distribution systems must be made very carefully. Current technology available for acid distribution includes cast iron troughs, pipe type and alloy trough distributors.
Summary
Manufacturing hydrogen from hydrogen sulphide has been acherished goal of many researchers at least since the turn of the century. So far, none of the schemes has achieved commercial success. Recent years, however, have seen a significant pick-up of activity in this area, with a number of projects moving out of the laboratory and into the field. Ed Luinstra* reviews the status of four of the leading processes.Abstract
Large quantities of hydrogen are used to refine petroleum fuels and to manufacture methanol and 'ammonia. Further pressure is being placed on the supply of hydrogen in refineries as permissible sulphur levels in fuels are declining. Besides its uses to refine oil, hydrogen is also used to convert heavy streams such as crude oil residue an'd oil sands bitumen to high quality transportation fuels.
Most of the hydrogen used in refineries is made by reforming naphtha, and additional amounts are made by steam methane reforming (SMR). Methane reform ing is also practised on a large scale for supplying hydrogen to !the methanol and ammonia industries. In a small number of locations where electricity is cheap, hydrogen is made by the electrolysis of water.
Summary
With the trend towards the processing of more sour crude and natural gas coupled with tighter restrictions on sulphur emissions, the growth in the use of selective amines in gas sweetening is set to continue. Lisa Connock reviews some of the current trends in the use of amine solvents for gas sweetening and Claus tail gas treating.Abstract
T he most widely used method of treating gas streams to remove hydrogen sulphide (H2S) and/or carbon dioxide (C02) is to treat them with aqueous alkanolamine solvents (amines) in an absorption/ regeneration treating system (see Figure 1).
Amine solvents can be used over a wide range of process conditions, ranging from essentially atmospheric pressure for refinery off-gas and Claus tail gas treating, to high pressure for natural gas sweetening.
The type of amine used for a particular application depends on the following factors:
A review of the most common alkanolamines for gas sweetening was provided in Sulphur No. 218. 1 In this article we focus on recent trends in solvent selection for amine sweetening units and Claus tail gas treating.