Maintaining HF solubility in alkylation isobutane recycle
US4010218A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1975 |
| Grant date | Mar 1, 1977 |
| Priority date | — |
| Expiry date | Nov 19, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S585/91
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In an HF alkylation process it has been found that combining olefin-acting reactant with a recycle stream including isobutane and HF upstream of an alkylation reaction zone is not harmful to alkylate product quality except when the HF is in a free state, i.e., the HF concentration is above the HF solubility level of the recycle stream. Soluble HF in the recycle stream is not harmful to alkylate product quality, therefore, in an embodiment, the overhead vapor stream of an isobutane stripper is condensed, cooled to a separation temperature, and separated into an HF phase and a hydrocarbon phase, a portion of which is withdrawn as an acid saturated recycle stream including isobutane and entrained acid, and heated to a temperature sufficient to place in solution the entrained acid prior to combination of the acid saturated recycle stream with the olefin-acting reactants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.