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Dehydrohalogenation reactor and process

A dehydrohalogenation and reactor technology, applied in the field of electric heating reactors, can solve the problems of heat transfer surface coking, efficiency loss, large molten salt flow, etc.

Pending Publication Date: 2021-09-14
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Another problem with molten salt systems is the need for uniform heating throughout the reactor, as lower localized temperatures will result in a loss of reaction efficiency, while higher localized temperatures will result in coking of heat transfer surfaces, which also results in a loss of efficiency. loss
Overcoming these difficulties requires very large molten salt flows, which in turn leads to high capital and operating costs associated with the large pumps and piping required

Method used

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  • Dehydrohalogenation reactor and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] In this example, a thermally insulated 1" x 0.065" Inconel 625 tubular reactor was used, with a 7-point thermocouple inserted into the inside of the tube with a 1 / 8" OD. The distance between two adjacent temperature probe points was 4″. The reactor serves as a pressure vessel, heating element and heat transfer surface. A Flex Kraft rectifier with a maximum output of 5 V and 140 A was used to provide DC (direct current) power to the Inconel 625 reactor. Once the hot spot temperature of the reactor reached its setpoint, the flow of the 244bb feed was started. During the course of the reaction, the reactor effluent was periodically sampled for its composition.

[0069] Table 1 lists their average reactivity under various conditions. Higher activity was observed in this impedance heater reactor than in conventional (externally heated) reactors. For example, near 30% conversion of 244bb is achieved at temperatures below 450°C. In addition, as shown in Table 1, the selec...

Embodiment 2

[0075] The same reactor and setup as described in Example 1 was used in Example 2. A speed test was performed by doubling the feed rate. In one experiment, the feed rate was doubled, but the DC input power was kept the same (2.57V / 118.2A). As shown in Table 2, doubling the feed rate resulted in a significant decrease in both hot spot temperature (~468°C down to ~453°C) and 244bb conversion (~39% down to ~11%). However, both the hot spot temperature and the 244bb conversion increase with increasing input power. As shown in Table 2, at 2.76V / 126.2A, the hot spot temperature and 244bb conversion increase to ~483°C and ~40%, respectively. In conclusion, comparable 244bb conversions were achieved by increasing the electrical input power by about 15% for doubling the feed rate.

[0076] Table 2*

[0077]

[0078] *Organic composition - 0.8GC area% 245cb / 94.9GC area%244bb / 4.1GC area%1233x.

Embodiment 3

[0080] The same reactor and setup as described in Example 1 was used in Example 3. The effect of HCl / HF treatment was studied. By making HCl (or HF) / N 2 The mixed stream was HCl / HF treated by passing through the reactor maintained at high temperature (see Table 3 for conditions). As shown in Table 3, a slightly higher conversion of 244bb was observed after HCl / HF treatment, while the selectivity to 1234yf remained almost unchanged. Note that selective conversion from 1234yf to 1233xf occurs after similar HF treatment in a conventional reactor.

[0081] table 3*

[0082]

[0083] *Organic composition - 0.8GC area%245cb / 94.9GC area%244bb / 4.1GC area%1233x

[0084] ＃ Calculated assuming no 244bb dehydrofluorination occurred.

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Abstract

He invention provides a reactor comprising a reaction chamber having a catalytic surface in contact with reactants in said chamber; and a source for passing electrical current through said catalytic surface. The reactor can be used for dehydrohalogentation reactions, such as dehydrochlorination of HCFC-244bb to HFO-1234yf, and for reactions where zero valent metals are employed for catalysis. The invention further provides a process to prepare HFO-1234yf from HCFC-244bb using an electrically heated reaction chamber.

Description

[0001] This application is a divisional application of an invention patent application with an application date of October 14, 2016, an application number of 201680060101.5, and a title of "dehydrohalogenation reactor and method". technical field [0002] The invention relates to electrically heated reactors. Without limitation, the reactor can be used for dehydrohalogenation reactions and can have various configurations, including tubular designs. Background technique [0003] Fluorocarbons, especially as a class of fluorinated olefins, have many different uses, including as chemical intermediates and monomers. In particular, these products are useful as refrigerants, monomers or intermediates for the preparation of refrigerants, especially refrigerants considered to have a low global warming potential. [0004] Considering global warming, hydrofluoroolefins (HFOs) are commercialized as substitutes for chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and hydrof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/06C07C17/25C07C21/18
CPCB01J8/067C07C17/25B01J2208/00415C07C21/18B01J23/745B01J23/755Y02P20/582B01J2219/00132B01J8/065B01J15/005B01J16/005B01J19/24B01J19/242B01J2208/00407B01J2219/00135B01J2219/00763B01J2208/06B01J8/0221B01J23/72C07C17/23C07C17/42
Inventor H.科卡利R.J.鲁夫趙宇安童雪松R.A.史密斯
Owner HONEYWELL INT INC
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