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C2 Acetylene Hydrogenation
The document discusses the c2pt catalyst process technology for acetylene hydrogenation, detailing various feedstock sources such as ethane, propane/butane, and refinery naphtha. It outlines the significance of feedstock purity and composition on ethylene yields, as well as the chemical processes involved in acetylene hydrogenation and the configurations of ethylene plant flowsheets. Additionally, it highlights operational considerations, reactor design, and the challenges associated with catalyst use and impurities.
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C2 Acetylene Hydrogenation
- 1. C2PT Catalyst ProcessTechnology C2 Acetylene Hydrogenation
- 2. Ethane usually recovered fromnatural gas fields mainly USA Propane/butane recovered from gas fields middle east, Texas etc. Kuwait has a large butane recovery system. Also can come from LNG plants Refinery naphtha / condensate C5 to C7 paraffin based low octane naphtha from refineries also from natural gas / oil well head production Light and heavy gas oils refinery based (200 to 350°C) AGO and (350 to 550 °C) VGO The more paraffinic the feedstock the higher the ethylene yields and the greater the value of the co-products Feedstock Sources
- 3. Sulfur Cracks infurnaces to give H2S and COS. Mercaptans in C3/C4 cuts, RSH and thiophenes in gasoline, benzo-thiophenes in fuel oil Arsenic Organic or arsine Makes arsine in the furnaces and some remains as organic Mercury Metallic / organic Decomposes to metallic some remains as organic Ballast water Sea water from shipping feed stock Metals Nickel, sodium, vanadium, iron from heavy feedstocks FCCU off gas (gas compressor suction, developing trend) NOx, H2S, amines, SbH3, As , COS, O2, CO2 plus others Major Feedstock Impurities
- 4. Base Intermediate Final C2H2+ H2 = C2H4 + H2 = C2H6 C2H2 = CH2 CH CH CH2 Butadiene = Green oil CH3 C CH + H2 Methyl Acetylene = CH3 CH CH2 propylene CH2 C CH2 + H2 Propadiene = CH3 CH CH2 propylene CH2 CH CH CH2 + H2 Butadiene = CH3 CH CH2 Butylene CH2 CH CH CH2 Butadiene = Green oil Relative reactivities C2H2 > C4H6 > C3H4 (MA) >> C3H4 (PD) > C2H4 Acetylene Basic Chemistry
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- 6. Cracking Furnaces Quench Compression Stages 1-3 Caustic Scrubber Compression Stage 4 Dry Figure1. Simplified Ethylene Flowsheet Cracking/Preliminary Clean-Up Fuel Oil Gasoline CO2 H2S H2O H2 CO C1 C2 C3 C4 C5+ * * - Possible C2H2 hydrogenation step, normally called wet gas stream
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- 8. H2 CO CH4 C2H2 C2H4 C2H6 C3H4 C3H6 C3H8 C4H6 C4H8 C4H10 C5+ Figure 2. FrontEnd De-Ethanizer C3H4 C3H6 C3H8 C4H6 C4H8 C4H10 C5+ DE-ETHANISER DE-METHANISER C2SPLITTER H2 CO CH4 C2H4 C2H6 Acetylene Hydrogenation Reactor Recycled to Cracking Furnaces ( Pd on alumina)
- 9. H2 CO CH4 C2H2 C2H4 C2H6 C3H4 C3H6 C3H8 C4H6 C4H8 C4H10 C5+ C4H6 C4H8 C4H10 C5+ DE-PROPANISER DE-METHANISER DE-ETHANISER H2 CO CH4 C3H4 C3H6 C3H8 C2SPLITTER Figure 3. FrontEnd De-Propanizer Acetylene Hydrogenation Reactor C2H4 C2H6 Recycled to Cracking Furnaces ( Pd on alumina)
- 10. DE-METHANISER DE-ETHANISER C2SPLITTER H2 CO CH4 C2H2 C2H4 C2H6 C3H4 C3H6 C3H8 C4H6 C4H8 C4H10 C5+ H2 CO CH4 C3H4 C3H6 C3H8 C4H6 C4H8 C4H10 C5+ Acetylene Hydrogenation Reactor H2 CO Figure 4. TailEnd De-Ethanizer C2H6 Recycled to Cracking Furnaces C2H4 ( Pd on alumina)
- 11. Ethylene Plant Flowsheets Placementof Acetylene Hydrogenation Reactor Cracker Feedstock / Product Variability Acetylene Reactor Feeds Reasons for Acetylene Removal Reacting Components and Conditions Reactor Operation and Reacting Components Reactor Design Selectivity vs. Temperature and Ethane Formation Effect of CO Poisons Green Oil Turndown H/D Ratio and Pressure Drop Thermocouple Placement Start-up Problems During Start-up Shut Down Regeneration Catalyst Experience, Problems and Other Information Front End / Tail End Comparison Acetylene Hydrogenation