Tag: Catalyst

Cobalt-molybdenum (CoMo) catalysts are integral components of tail gas units (TGUs), playing a vital role in reducing harmful sulphur dioxide (SO2 ) emissions arising from Claus sulphur recovery units. Effective activation of these catalysts is essential for their optimal performance. The consequence of sulphiding at low temperatures and atmospheric pressure in low temperature TGUs is to compromise effectiveness of catalyst activation. In the first part of this two-part article, Michael Huffmaster , Consultant, explores CoMo catalyst activation at low pressure, focusing on sulphiding reaction pathways and the impact of temperature and the composition of the sulphiding media on reaction kinetics, specifically the concentration of H2 , H2 S, and H2 O.

MECS, Inc. (MECS) has developed a new impaction-based mist eliminator called Brink® Prime Impact™ , which offers equivalent or improved efficiency at higher throughput and the same pressure drop as traditional impaction beds, resulting in the ability to debottleneck existing inter-pass absorption towers and final absorption towers in sulphuric acid plants or design new or replacement towers with smaller diameters, thus reducing investment cost.

Axens has developed a new titania-based catalyst named CRS 41, which has a much larger porosity than its renowned predecessor, CRS 31 catalyst. Thanks to an improved catalyst manufacturing process and a new recipe, the porosity of CRS 41 has been increased while preserving the mechanical resistance for loading, allowing customers to optimise their capex by either reducing the Claus reactor size or loading volume of TiO2 catalyst.

Data has always been crucial for successful operations in the chemical industry, but the growing volume of data is only as good as our ability to analyse it. Now, the market is about to experience a step change in data assessment, and Clariant is fully on track, thanks to cutting-edge technologies for real-time data monitoring, visualisation, and information exchange.

Toyo Engineering Corporation (TOYO), a global leading engineering contractor, has developed g-Methanol® technology. Methanol, traditionally produced from fossil resources, is now gaining attention for synthesis using carbon dioxide and hydrogen from renewable sources. This article explores methanol synthesis technology and the challenges in utilising renewable energy sources.

As the production of renewable methanol continues to scale up, it will provide a long term, carbon-neutral energy solution to different transport sectors. However, the optimum design parameters for green methanol plants are substantially different to natural gas-based methanol plants and pose new challenges to the methanol loop designer. Connor Longland of Johnson Matthey (JM) discusses the challenges and presents the benefits of the tube cooled converter for e-methanol production.

With the current focus on decarbonising ammonia production, Tom Davison of Johnson Matthey explains the important role of high activity ammonia synthesis catalyst in the production of green ammonia.

Sumit Rao of Hindustan Platinum Private Ltd describes two recent start-up issues with catalyst gauze packs at a nitric acid plant, and their remediation to allow production to continue.

As plants move towards full unit control, Jochen Geiger of Ametek Process Instruments provides an overview of how the latest sulphur plant analysers are providing greater insight into sulphur plant operations.

Rohit Khurana and Umesh Jainker of KBR presented a technical paper on this topic during the 2013 Asian Nitrogen + Syngas Conference. It can be found in the UreaKnowHow.com E-Library with the title: ”Replacing ammonia plant catalyst with maximum efficiency and lowest cost”. The paper addresses the importance of de-dusting catalyst beds before commissioning and the serious impacts on the plant if not performed thoroughly. Many ammonia plants have faced problems related to the plugging of exchangers, pipe choking, pressure drop increase of the downstream catalyst beds and separators or foaming in the CO 2 removal section which could be caused by the presence of catalyst dust. Most of these problems have led to either decrease in the efficiency of the plant or operation at lower throughputs. The paper presents the critical steps and procedures for proper dedusting of the catalyst beds before commissioning. In addition, the foaming problem in the CO 2 removal section associated with catalyst dust is discussed signifying the importance of cleaning the CO 2 removal system and solution. The role of filters in the CO 2 removal section was also emphasised.