Method of producing a fuel additive
AssigneesSabic Global Technologies B.V., Saudi Arabian Oil Company
InventorsGuillermo Leal, Kareemuddin Mahaboob Shaik, Hiren Shethna, Naif Mohammed Al-Naddah Al-Otaibi, Mohammed Bismillah Ansari, Zhonglin Zhang
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Abstract
A method of producing a fuel additive includes passing a feed stream comprising C4 hydrocarbons through a butadiene extraction unit producing a first process stream; passing the first process stream through a methyl tertiary butyl ether unit producing a second process stream and a methyl tertiary butyl ether product; passing the second process stream through a hydration unit producing the fuel additive and a recycle stream; passing the recycle stream through a hydrogenation unit; and recycling the recycle stream to a steam cracker unit and/or to the feed stream
Claims20
A method of producing a fuel additive, comprising:
- passing a feed stream comprising C4 hydrocarbons through a butadiene extraction unit producing a first process stream;
- passing the first process stream through a methyl tertiary butyl ether unit producing a second process stream and a methyl tertiary butyl ether product;
- passing the second process stream through a hydration unit producing the fuel additive and a recycle stream, wherein the second process stream comprises butene, and wherein at least a portion of the butene present in the second process stream is converted to butanol within the hydration unit;
- passing the recycle stream through a recycle hydrogenation unit;
- and
- recycling the hydrogenated recycle stream from the recycle hydrogenation unit to a steam cracker unit and/or to the feed stream.
A method of producing a fuel additive, comprising:
- passing a feed stream comprising C4 hydrocarbons through a catalytic cracking unit;
- passing the feed stream through a butadiene extraction unit producing a first process stream, wherein the butadiene extraction unit comprises extractive distillation, solvent degassing, solvent regeneration, solvent recovery, or a combination thereof, and wherein the feed stream comprises butadiene and wherein the first process stream withdrawn from the butadiene extraction unit comprises less than or equal to 5% butadiene by weight;
- withdrawing a butadiene product from the butadiene extraction unit;
- passing the first process stream through a methyl tertiary butyl ether unit producing a second process stream and a methyl tertiary butyl ether product, wherein methanol and isobutylene are present in the methyl tertiary butyl ether unit in a molar ratio of one mole of isobutylene to 0.1 moles to 5 moles of methanol;
- withdrawing the methyl tertiary butyl ether product from the methyl tertiary butyl ether unit, wherein the first process stream comprises isobutylene and wherein greater than or equal to 75% by weight of the isobutylene present in the first process stream is converted to methyl tertiary butyl ether within the methyl tertiary butyl ether unit;
- passing the second process stream through a hydration unit producing the fuel additive and a recycle stream, wherein a temperature within the hydration unit is 30° C. to 250° C., a pressure within the hydration unit is 500 kiloPascals to 20,000 kiloPascals, and wherein the second process stream comprises butene and wherein 1.0 to 5090% by weight of the butene present in the second process stream is converted to butanol within the hydration unit;
- withdrawing the fuel additive from the hydration unit, wherein the fuel additive comprises at least one of 2-butanol, tert-butyl alcohol, or a C4 dimer;
- passing the recycle stream through a recycle hydrogenation unit, wherein the recycle stream comprises butene and wherein greater than or equal to 90% by weight of the butene present in the recycle stream is converted to butane within the recycle hydrogenation unit;
- and
- recycling the hydrogenated recycle stream from the recycle hydrogenation unit to the catalytic cracking unit.
Dependencies are inferred from the claim text.