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Dehydrogenation process with water control

a dehydrogenation process and hydrocarbon technology, applied in the field of catalytic dehydrogenation of hydrocarbons, can solve the problems of increasing the rate of undesired side reactions and the loss of selectivity of the process to the desired olefin, so as to improve the selectivity, reduce the inlet temperature of the reactor, and increase the catalyst life

Inactive Publication Date: 2009-11-05
UOP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The process disclosed herein is for catalytically dehydrogenating hydrocarbons using a very low concentration of or essentially no water or water precursors in the combined feed to a reactor when the dehydrogenation catalyst is fresh, and then increasing the concentration of water, water precursor, or both as the catalyst becomes less active or the conversion per pass declines. The benefits of this process can include increased catalyst life, reduced reactor inlet temperature for a given conversion per pass of the dehydrogenatable hydrocarbons, or improved selectivity. The catalysts used in the process contain a platinum group component and a promoter component supported on a carrier material. The process is particularly useful for layered catalyst compositions and surface-impregnated catalysts.

Problems solved by technology

As this temperature rises, the rate of undesired side reactions will increase, and the selectivity of the process to the desired olefin will suffer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0079]Catalysts A, B, and C were dehydrogenation catalysts, each comprised a layered composition having an inner core and an outer layer bonded to the inner core. The properties of catalysts A, B, and C are in Table 1. Catalysts A, B, and C contained platinum and tin distributed uniformly on the outer layer. Catalyst D was a dehydrogenation catalyst containing platinum, tin, and lithium distributed uniformly on a gamma alumina support, and not a layered composition. Based on the weight of the catalyst, catalyst D contained 0.4 wt-% platinum, 0.5 wt-% tin, 0.6 wt-% lithium, and 0.4 wt-% indium. The atomic ratio of platinum to tin in catalyst D was 0.49.

TABLE 1CatalystABCCoreCordieriteCordieriteCordieriteCore Diameter, mm1.801.761.68LayerGammaGammaGammaaluminaaluminaaluminaLayer Thickness, micron10010060Platinum, wt-% of catalyst0.160.160.43Tin, wt-% of catalyst0.130.130.32Lithium, wt-% of catalyst0.200.210.14Platinum / Tin Ratio, atomic0.740.740.83

[0080]The catalysts were tested for de...

example 2

[0082]Catalyst A was tested following the procedure in Example 1 in eight runs (Runs 2A to 2H), and water was injected into the combined feed during seven of the eight runs. Table 2 presents the test conditions and results for the runs. The start-of-run temperatures (SORTs) for the eight runs were within a range of 2° C. (4° F.), and the differences between the SORTs and the end-of-run temperatures (EORTs) were within a range of 2° C. (3° F.) for all eight runs except one. However, the variations in SORTs and in the differences between SORT and EORT did not have a significant effect on the improvements reported in Table 2, except as described below. Once water injection was started in runs 2B, 2D, and 2G, approximately 6000 wt-ppm water based on the weight of the combined feed was injected for varying periods of time, but these increases also did not have a significant effect on the improvements reported in Table 2. Shortly after water injection began after the start of a run, the r...

example 3

[0084]Catalyst B was tested twice according to the procedure in Example 1, and water was injected into the combined feed during both runs (Runs 3A and 3B). Table 3 presents the testing conditions and the resulting improvements. The SORTs for the runs were within 2° C. (3° F.), as were the differences between the SORTs and EORTs.

TABLE 3Increase inRunStart of Water InjectionDurationTime onover RunTemperature - SORTStream,Water,3A,% of (EORT -% of Runwt-% of RunRun° C. (° F.)SORT)Durationppm3A Duration3A0 (0)002000NA3B*17 (31)100794000693B**NANANANA34*Entire run.**Until water injection started.

[0085]Run 3A was a comparative run which had continuous 2000 wt-ppm water injection during the entire run. In Run 3B, the start of injection was postponed until EORT had been reached. Without water injection the run duration improved by only 34%. Shortly after water injection began, the reactor inlet temperature was lowered by from 16° C. (29° F.) to maintain the % TNO at 15 wt-%. Subsequently th...

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Abstract

The activity of a dehydrogenation catalyst is improved by increasing the water concentration maintained in the reactants toward the start of the catalyst's life, but after the catalyst has deactivated to the extent that the temperature required to maintain the conversion per pass of paraffinic hydrocarbon through the reaction zone increases by at least 2° C.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority from Provisional Application No. 60 / 654,243 filed Feb. 18, 2005, the contents of which are hereby incorporated by reference.FIELD OF THE INVENTION[0002]The invention relates to a process for the catalytic dehydrogenation of hydrocarbons.BACKGROUND OF THE INVENTION[0003]Processes for the catalytic dehydrogenation of hydrocarbons are well known. Paraffins having from 5 to 20 carbon atoms per molecule undergo such treatment to form the corresponding olefin. Olefins having from 9 to 16 carbon atoms per molecule are used to alkylate benzene to produce alkylbenzenes, which is an intermediate in the manufacture of detergents. Shorter chain olefins having 5 carbon atoms per molecule are used to alkylate isoparaffins or to etherify alcohols to make motor fuel blending components. A great many other uses for such olefins are known.[0004]Many catalytic dehydrogenation processes use a reactor containing a bed of cataly...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C5/333
CPCB01J23/56B01J23/626B01J35/008B01J37/0221C07C5/3337C07C2521/04C07C2523/42C07C2523/04C07C2523/14C07C11/02B01J35/397
Inventor VOGEL, CHRISTOPHER J.RENDE, DEAN E.BOZZANO, ANDREA G.WING, PAUL G.KAWAI, HIROIKU
Owner UOP LLC
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