Unlock instant, AI-driven research and patent intelligence for your innovation.

Potassium supplementing method of styrene catalyst prepared via ethyl benzene dehydrogenation

A technology of ethylbenzene dehydrogenation and catalyst, applied in chemical instruments and methods, catalyst regeneration/reactivation, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of catalyst activity reduction, potassium loss, etc.

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP +1
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the loss of potassium in the production process of the existing ethylbenzene dehydrogenation catalyst, thereby causing the problem that the activity of the catalyst is reduced, and a new potassium supplement method for preparing styrene catalyst by ethylbenzene dehydrogenation is provided

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
  • Potassium supplementing method of styrene catalyst prepared via ethyl benzene dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The isothermal bed evaluation unit was loaded with 100 ml of deactivated catalyst and the potassium loss was measured to be 5% by weight. At a reaction temperature of 620°C, the weight ratio of water / ethylbenzene is 1.6, and the space velocity of ethylbenzene is 1.0 hours -1 Under the conditions of reaction, the condensate of the reaction product is subjected to chromatographic analysis every 100 hours to obtain the conversion rate of ethylbenzene and the selectivity of styrene. The results are shown in Table 1.

Embodiment 2

[0014] After the catalyst reacted for 1000 hours, the KOH solution was passed through the heating furnace to generate 800°C high-temperature superheated steam and then passed into the reactor. The concentration of KOH in the steam was controlled to be 50mg / Kg, and the supplement was continued for 48 hours. All the other conditions are with embodiment 1.

Embodiment 3

[0016] After the catalyst reacted for 1000 hours, the KOH solution was passed through the heating furnace to generate 800°C high-temperature superheated steam and then passed into the reactor. The concentration of KOH in the steam was controlled to be 100 mg / Kg, and the supplement was continued for 48 hours. All the other conditions are with embodiment 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 relates to a potassium supplementing method of styrene catalyst, mainly solving the problems that the potassium losses in the using process of a catalyst and the potassium elements can not be completely evenly distributed because the potassium solution enters a rector along an ethyl benzene raw material in form of liquid in the former process of catalyst potassium supplementation. The invention greatly solves the problems by adopting the technical scheme of firstly judging the potassium loss of the catalyst and the needed potassium supplementing amount according to the reaction data of ethyl benzene dehydrogenation, and then guiding the potassium solution into the reactor through overheat steam in a state of gas phase for supplementing potassium. In addition, the invention can be applied to the industrial production of styrene prepared via ethyl benzene dehydrogenation.

Description

technical field [0001] The invention relates to a method for supplementing potassium as a catalyst for preparing styrene through dehydrogenation of ethylbenzene. Background technique [0002] At present, more than 85% of the industrial production of styrene is produced by dehydrogenation of ethylbenzene. The catalyst used in the production process is a Fe-K-Ce-Mo-Mg composite catalyst, in which Fe 2 o 3 as the main active phase, K 2 O is an activity accelerator. The addition of potassium to the catalyst increases its activity by an order of magnitude. However, in actual industrial production, with the reaction of the catalyst, the erosion of water vapor and the raw material solution, the potassium content of the catalyst is gradually reduced, and the catalytic performance of the catalyst is also reduced, thereby shortening the life of the catalyst. Researchers have attempted to add a small amount of Li to the catalyst system 2 O. WO 3 to prevent potassium loss. [00...

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 Patents(China)
IPC IPC(8): B01J38/04B01J23/94C07C15/46C07C5/333
CPCY02P20/52Y02P20/584
Inventor 刘剑锋缪长喜廖仕杰徐红军徐永繁
Owner CHINA PETROLEUM & CHEM CORP