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US 2026/0250436 A1Published application
Process and apparatus for the preparation of highly reactive polyisobutylene
AssigneeHindustan Petroleum Corporation Limited
InventorsMonikangkana TALUKDAR, Laxmi, Ujjal HALDAR, Yogesh Popatrao PATIL, Bennet CHELLIAHN, Srinivasa Narasimha SHESHACHALA
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Abstract
The present invention relates to a process and an apparatus for the preparation of highly reactive polyisobutylene (HR-PIB) having wide range of industrial applications across different sectors. The highly reactive polyisobutylene (HR-PIB) obtained from the process of the present invention has a number average molecular weight in the range of 500-5000 and an exo-content of at least 80 mole %.
Claims10
A process for preparing a highly reactive polyisobutylene (HRPIB), the process comprising:
- i. routing a Lewis acid [1] and a Lewis base [2] in a weight percentage ratio of 1:0.8-2.5 in a catalyst premix reactor [3] for preparing a homogeneous catalyst complex [4];
- ii. routing the homogeneous catalyst complex [4], a C4 raffinate feed [6] and a solvent [5] in a polymerization reactor [7] for a polymerization reaction to obtain a mixture [8] comprising the highly reactive polyisobutylene (HR-PIB), unconverted C4 monomers, water, C8 oligomers, C12-C16 oligomers and a residual catalyst;
- iii. routing the mixture [8] to a high pressure distillation column [9] for removing unconverted C4 monomers from the mixture [8] to obtain a bottom product comprising the highly reactive polyisobutylene (HR-PIB), water, C8 oligomers, C12-C16 oligomers and the residual catalyst;
- iv. routing out the unconverted C4 monomers from top of the high pressure distillation column [9] followed by recycling the unconverted C4 monomers back to a naphtha cracker;
- v. routing the bottom product to a neutralization tank for quenching the residual catalyst in a basic media by adding a polymerization quencher routed to the neutralization tank from a polymerization quench tank to obtain a neutralized effluent comprising a catalyst salt, and a product;
- vi. routing the neutralized effluent to a decanter for removing water from the neutralized effluent to obtain an aqueous effluent comprising the catalyst salt, and an organic effluent comprising C8 oligomers, C12-C16 oligomers, and the highly reactive polyisobutylene (HR-PIB);
- vii. routing the organic effluent to a divided wall distillation (DWD) column for removing the C8 oligomers and the C12-C16 oligomers from the organic effluent to obtain the highly reactive polyisobutylene (HR-PIB) [23];
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- viii. optionally routing the organic effluent to a second distillation column and a third distillation column arranged in a sequence for removing the C8 oligomers through atmospheric high-pressure distillation and the C12-C16 oligomers through vacuum high-pressure distillation, respectively from the organic effluent to obtain the highly reactive polyisobutylene (HR-PIB) [23].
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An apparatus for preparing a highly reactive polyisobutylene (HR-PIB), the apparatus comprising:
- i. a plug flow reactor (PFR) [3] for preparing a homogenous catalyst complex [4];
- ii. a polymerization reactor [7] connected to the plug flow reactor [3] to receive the homogenous catalyst complex [4], along with a C4 raffinate feed [6] and a solvent [5] for a polymerization reaction to provide a mixture [8];
- iii. a high pressure distillation column [9] connected to the polymerization reactor [7] to receive the mixture [8] from the polymerization reactor [7] for removing unconverted C4 monomers from the mixture [8] to obtain a bottom product [11], wherein the unconverted C4 monomers is routed out from top of the high pressure distillation column [9] and recycled back to a naphtha cracker;
- iv. a neutralization tank connected to the high pressure distillation column [9] to receive the bottom product from the bottom of the high pressure distillation column [9] for neutralizing the residual catalyst in the bottom product with a polymerization quencher to obtain a neutralized effluent comprising a catalyst salt, water, C8 oligomers, C12-C16 oligomers and a highly reactive polyisobutylene (HR-PIB);
- v. a polymerization quench tank connected to the neutralization tank for supplying the polymerization quencher to the neutralization tank [12];
- vi. a decanter connected to the neutralization tank to receive the neutralized effluent to remove water from the neutralized effluent to obtain an aqueous effluents comprising the catalyst salt, and an organic effluent comprising C8 oligomers, C12-C16 oligomers, and the highly reactive polyisobutylene (HR-PIB);
- vii. an aqueous tank connected to the decanter to receive the aqueous effluents [17];
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- viii. a divided wall distillation (DWD) column connected to the decanter to receive the organic effluent from the decanter for the removal of C8 oligomers and C12-C16 oligomers from the organic effluent to obtain the highly reactive polyisobutylene (HR-PIB) [23].
6 more elements
Dependencies are inferred from the claim text.