Composite layer agglomerating adsorbent and preparation process thereof
US12330135B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 24, 2020 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | Jul 13, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2220/603
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides a composite layer agglomerating adsorbent, comprising an outer adsorbent layer containing a low silica X molecular sieve and an inner adsorbent layer containing a high silica X molecular sieve, the low silica X molecular sieve has a silica/alumina molar ratio of 2.07-2.18, the high silica X molecular sieve has a silica/alumina molar ratio of 2.2-2.5, based on the total amount of the adsorbent, the adsorbent comprises 95.0-100 mass % of the X molecular sieve and 0-5.0 mass % of the matrix, the cation sites of the X molecular sieve in the adsorbent are occupied by a metal of Group IIA or occupied together by a metal of Group IA and a metal of Group IIA. The adsorbent is suitable for the process of adsorptive separation of PX from C8 aromatic hydrocarbons using light aromatic hydrocarbons as desorbent, and has high adsorption selectivity and good mass transfer performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.