Method for recovering organic acid and cobalt-manganese metal in terephthalic acid oxidized residues
A terephthalic acid and recovery method technology, applied in the field of organic acid and cobalt-manganese metal recovery and reuse, can solve problems such as unstable valence state of cobalt-manganese ions, environmental pollution, and reduced activity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0020] Take the oxidation residue 1000g of the PTA oxidation (first) device, wherein the cobalt content is 0.92%, the manganese content is 0.95%, and the solid content is 40.6%, the temperature is adjusted at 65 ~ 70 ℃, and the solid matter is separated by filtration while it is hot, and then Wash once with 70°C hot water about the same volume as the solid. The solid is dried and weighed to 181.4g. It is directly returned to the oxidation system for re-oxidation or sold as raw material for synthetic resins; solid oxalic acid is added to the filtrate (oxalic acid concentration ≥ 99.5%, the same below) 41.67g, the molar ratio of oxalic acid to cobalt manganese in the filtrate is 1:1, stir and heat up to 80~85°C, filter while hot, the isolated pink solid is the cobalt manganese oxalate compound , the quality after drying is 56.51g, wherein cobalt-manganese content is respectively 16.14%, 15.32%, and the recovery rate of cobalt-manganese is respectively 99.1% and 91.2%; A large nu...
Embodiment 2
[0022] Add 20 g of the cobalt-manganese oxalate separated in Example 1 into a 250 ml reactor, add 100 g of manganese-containing 6% manganese acetate aqueous solution, add 20 g of hydrobromic acid with a concentration of 48% and slowly add 16.4 g of 27.5% hydrogen peroxide , the molar ratio of cobalt manganese oxalate to hydrogen peroxide is about 1:1.2, stir and heat up to 95~100°C, pay attention to cooling and reflux to prevent the bromine produced in the reaction from volatilizing, and when the solids are completely dissolved, reheat in the reactor Add 20g of metallic cobalt, continue heating for about 50 minutes, and filter to obtain a homogeneous solution containing cobalt, manganese and bromine. The mixed solution can be directly mixed with cobalt acetate, manganese acetate, cobalt bromide, and manganese bromide as an oxidation catalyst for PTA.
[0023]
Embodiment 3
[0025] Take 500g of the oxidation residue from the PTA oxidation (A) device, add water to dilute it twice, adjust the temperature at 85~90°C, filter and separate the solid matter while it is hot, and then wash once with hot water at 90°C about the same volume as the solid matter. The weighing of solid after drying is 81.5g, directly returns to oxidation system reoxidation or sells the raw material that is used for synthetic resin; Add oxalic acid 25.0g in filtrate, the mol ratio of cobalt manganese in oxalic acid and filtrate is 1.2: 1, stirs and heats up to 80~85℃, filter while it is hot, the isolated pink solid is cobalt manganese oxalate compound, the mass after drying is about 29.57g, of which the cobalt manganese content is 15.48% and 15.95% respectively, the recovery rate of cobalt manganese They were 99.5% and 99.3% respectively; the separated filtrate was further cooled to 20~15°C, at this time, white and light yellow solids were precipitated in the solution, and a smal...
PUM
Property | Measurement | Unit |
---|---|---|
recovery rate | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com