Method for processing acetic acid solvent in oxidising unit of PTA industrial apparatus
US9902680B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2015 |
| Grant date | Feb 27, 2018 |
| Priority date | — |
| Expiry date | Feb 11, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C63/26
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a method for processing acetic acid solvent in an oxidizing unit of a PTA industrial apparatus; said method uses a pressure filter machine to filter crude terephthalic acid slurry, and then, using a multi-stage counter-current method, uses washing water to wash the acetic acid solvent, and, by means of setting up a bias-current and drainage, prevents residual liquid in the filtrate pipe from entering the next area following the rotation of the pressure filter machine, improving washing efficiency and reducing the amount of washing water; the present invention integrates the processes of filtering and washing crude terephthalic acid into a single pressure filter machine, such that the process is shorter, the occupied floor space is reduced, and energy consumption is lower. A method feeding nitrogen gas into the mother liquor tank and washing liquid tank is used to regulate the pressure balance of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.