Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Regeneration method of high-activity palladium catalyst

一种钯催化剂、高活性的技术，应用在催化剂再生/再活化、化学仪器和方法、物理/化学过程催化剂等方向，能够解决再生不够彻底、钯催化剂活性达不到新钯催化剂活性、再生钯催化剂活性达不到等问题

Active Publication Date: 2019-08-02
FUJIAN FUDA BAIYANG CHEM TECH CO LTD
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention has restored the activity of palladium catalyst to a certain extent, the regeneration of this method is not thorough enough and fails to solve the problem of catalyst activity reduction caused by the growth of palladium particles, resulting in the activity of regenerated palladium catalysts not reaching that of new palladium catalysts. At the same time, after repeated regenerations, the activity of the regenerated palladium catalyst cannot reach the necessary activity required for production, so it can only be scrapped

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Regeneration method of high-activity palladium catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The highly active palladium catalyst regeneration method of the present embodiment comprises the steps:

[0050] Pre-treatment: Sieve the spent palladium catalyst with a 10-mesh screen to remove particles with a particle size below 2mm to obtain the palladium catalyst to be regenerated.

[0051] Step 1: Weigh 100g of palladium catalyst to be regenerated (FAH-1Q fixed-bed palladium-alumina catalyst scrapped after 6 years of use) into a 500mL beaker, add 180mL of C 10 Aromatic hydrocarbons are soaked, and the aromatic hydrocarbons are separated after soaking for 30 minutes each time, and then the same amount of aromatic hydrocarbons as the first time is added, and soaked in this way for 9 times, and the aromatic hydrocarbons separated in the last time are light yellow;

[0052] Then add 160mL of sodium hydroxide (NaOH) solution with a concentration of 0.1mol / L and a temperature of 30-50°C to the palladium catalyst soaked in the above-mentioned aromatic hydrocarbons for so...

Embodiment 2

[0066] Repeat the step of embodiment one, just change the mol ratio of sodium chlorate and palladium into 1: 1.5 in wherein step 2, the mol ratio of sodium chlorate and hydrochloric acid is changed into 1: 10, promptly this example sodium chlorate consumption=0.000535614 ÷1.5×106.44÷0.99=0.0383911 (g), wherein 106.44 is the molar mass of sodium chlorate, and 0.99 is the purity of sodium chlorate, considering balance precision, getting 0.0384g) hydrochloric acid consumption is 0.000535614÷1.5×10÷0.012= 0.29756 (mL) is rounded to 0.30mL, the consumption of the sodium hydroxide that is used to regulate catalyst surface pH value still takes by weighing 0.06g in the ratio of embodiment one, the test method of palladium content, activity and compressive strength of catalyst is carried out Example 1 is carried out, and the data are shown in Table 1.

Embodiment 3

[0068] Repeat the step of embodiment one, just used Na when step 3 regulates catalyst surface pH value 2 CO 3 , the ionic equation of the hydrolysis of sodium carbonate is:

[0069] CO 3 2- +H 2 O==HCO 3- +OH -

[0070] HCO 3 - +H 2 OH 2 CO 3 +OH -

[0071] Visible 1 mole of sodium carbonate hydrolysis produces the alkalinity that is close to the alkalinity of 2 moles of sodium hydroxide, and setting sodium carbonate consumption is 0.10% of catalyzer weight (equivalent to NaOH consumption is 0.2% of catalyzer weight), for this reason Na 2 CO 3 Consumption=30×0.001÷0.995=0.03015(g), actually weigh 0.0302g, 0.995 is the NaOH purity, and the rest are carried out as in Example 1. The test data of palladium content, activity and compressive strength of the catalyst are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a regeneration method of a high-activity palladium catalyst, which enables a palladium catalyst which has the activity not meeting the production demands through treatment withexisting regeneration methods to obtain the activity required for production or higher activity. The method comprises steps as follows: step 1: impurities in the palladium catalyst required to be regenerated are removed; step 2: the palladium catalyst without the impurities is subjected to a reaction with a sodium chlorate solution and hydrochloric acid; step 3: the pH value of a solution obtainedafter the reaction in the step 2 is adjusted to 4 or higher, and drying is performed; step 4: a sample dried in the step 3 is roasted.

Description

[0001] This case is a divisional application based on the invention patent with the filing date of 2016-09-22, the application number of 201610840632.8, and the title of "a palladium catalyst regeneration method" as the parent case. technical field [0002] The invention relates to the technical field of chemical production, in particular to a high-activity palladium catalyst regeneration method. Background technique [0003] In the production of hydrogen peroxide, palladium catalysts (Pd-Al 2 o 3 ), with the prolongation of the use time, its activity will gradually decrease. When the activity of the catalyst decreases to the point that it cannot maintain normal production, it must be activated and regenerated to restore most of the activity and meet the normal production requirements. At present, there are mainly three types of palladium catalyst regeneration: water vapor regeneration, aromatic hydrocarbon regeneration and oxidation liquid regeneration, or a combination of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/96B01J38/02B01J38/60B01J38/64
CPCB01J23/96B01J38/02B01J38/60B01J38/64
Inventor 王榕
Owner FUJIAN FUDA BAIYANG CHEM TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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