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A method of improving a dehydrogenation process

A dehydrogenation and process technology, applied in the direction of organic dehydrogenation, chemical instruments and methods, hydrocarbons, etc., can solve the problems of shortened operation cycle, decreased catalyst bed output, less catalyst, etc.

Inactive Publication Date: 2011-05-04
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thin beds contain less catalyst, which results in lower yields from the catalyst bed
Additionally, the catalyst deactivates over time and operating the reactor with less catalyst results in shorter run times

Method used

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  • A method of improving a dehydrogenation process
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  • A method of improving a dehydrogenation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0075] This example calculates the reactor inlet temperature to maintain a constant 65% conversion for the reactor of Example 1 at 3 and 24 months, with the full volume of conventional catalyst removed and the reactor charged with 75% of Example 1. Same low decline rate catalyst as described in 2. This means that the volume of catalyst in this reactor is 75% of the volume of catalyst used in Examples 1 and 2. All process variables except temperature were the same as in Example 1. The results are shown in Table 1 and show that at 24 months there was still some remaining catalyst activity.

Embodiment 4

[0077] This example calculates the reactor inlet temperature to maintain a constant 65% conversion for the reactor of Example 1 at 3 and 24 months, with the full volume of conventional catalyst removed and the reactor charged with 50% of Example 1. Same low decline rate catalyst as described in 2. All process variables except temperature were the same as in Example 1. The results are shown in Table 1 and indicate that the reactor reached the end of the operating conditions.

[0078] As can be seen from these examples, the same 24-month run period can be achieved using either a reactor filled with conventional catalyst or a reactor filled with 50% low decline rate catalyst. Alternatively, the reactors in Examples 2 and 3 can be operated for longer than 24 month run periods before the inlet temperature reaches a maximum of 650°C. A higher inlet temperature was required at 3 months for Examples 3 and 4 to compensate for the higher liquid hourly space velocity.

[0079] Table 1...

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Abstract

The invention relates to a method of improving a dehydrogenation process comprising: removing a volume of a first dehydrogenation catalyst from a radial dehydrogenation reactor; loading the reactor with a volume of a second dehydrogenation catalyst that has a lower decline rate than the first dehydrogenation catalyst; and passing a dehydrogenatable hydrocarbon through the reactor wherein the volume of the second catalyst is at most 90% of the volume of the removed catalyst.

Description

technical field [0001] The present invention relates to a method for improving the dehydrogenation process. Background technique [0002] There are continuous efforts to improve the efficiency of dehydrogenation process systems. An important goal is to ensure that the catalyst is removed after an optimal operating period. If removed prior to the optimum operating period, the catalyst will have unused residual activity. If the catalyst is removed after the optimum operating period, the system will operate at less than optimum conversion for a period of time. In most cases, the operating cycle is determined by external factors, so the goal becomes maximizing the use of the catalyst during the operating cycle. [0003] U.S. Patent Application Publication 2002 / 0065442 describes a method of improving the performance of a dehydrogenation process system in which the use of an annular annular vertical catalyst bed comprising a first annular vertical layer contained within the cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/333C07C15/46C07B35/04
CPCC07B35/04C07C5/333C07C5/3332C07C2523/745C07C15/46
Inventor R·D·纽曼
Owner SHELL INT RES MAATSCHAPPIJ BV
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