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Improved catalytic reformer unit and unit operation

A technology for catalytic reforming and reforming catalysts, which is applied in the direction of catalytic reforming of naphtha, control/regulation of reforming operations, reforming naphtha, etc., and can solve problems such as reducing reformed products and hydrogen yields

Inactive Publication Date: 2008-01-16
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the pressure is undesirable in many cases as this tends to reduce reformate and hydrogen yields, or the unit may already be operating close to the maximum design pressure of the plant

Method used

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  • Improved catalytic reformer unit and unit operation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this example, the refinery stream is 480 psig and the tail gas is 65 psig, resulting in a pressure change of 6.18. Feed compositions and pressures are common to refinery processing units such as those found in hydroprocessing or hydroprocessing applications. In this example, hydrocarbons are generally described by their carbon number, ie C 1 = methane, C 2 = Ethane, etc. RCPSA is capable of producing >99% pure hydrogen with >81% recovery over a range of flow rates. Tables 1a and 1b present the computer simulation results for RCPSA, and the feed and output percentages for the different components of this example. Tables 1a and 1b also show how hydrogen purity decreases as recovery increases from 89.7% to 91.7% for a 480 psig 6 MMS CFD stream and 65 psig tail gas.

[0064] Tables 1a and 1b

[0065] in H 2 RCPSA in decontamination (67 feet 3 ) feed and output composition (mol%).

[0066] The feed was 480 psi, 122 degrees Fahrenheit, and the exhaust was 65 psi. ...

Embodiment 2

[0078] In this example, the conditions are the same as in Example 1. Table 2a shows that conditions using both co-current and counter-current steps achieve >99% hydrogen purity. Table 2b shows that the countercurrent depressurization step can be eliminated and still maintain a hydrogen purity of 99%. In fact, it can be seen that by increasing the purge cycle time t P , by removing the time t from the countercurrent depressurization step CN , the hydrogen recovery can be increased to a level of 88%.

[0079] Table 2a and 2b

[0080] Step duration for RCPSA (67 ft. 3 ) of H 2 Effect on purity and recovery.

[0081] Same conditions as in Table 1. The feed was 480 psi, 122 degrees Fahrenheit, and the exhaust was 65 psi. The feed rate is approximately 6 MMSCFD.

[0082] Table 2a. Countercurrent Reduced Pressure, Medium Pressure = 105 psi

[0083] purity

Recovery rate

t F

t co

t CN

t P

t RP

％

％ ...

Embodiment 3

[0087] This example represents a refinery stream of 10 MMSCFD, also containing a typical composition as shown in the feed column of Table 3 (e.g. the feed composition contains 74% H 2 ). The stream is 480 psig, the RCPSA tail gas is 65 psig, so the absolute pressure becomes 6.18. Also the RCPSA of the present invention is capable of producing hydrogen at >99% purity with >85% recovery from these feed compositions. Tables 3a and 3b show the results of this example.

[0088] Tables 3a and 3b

[0089] in H 2 RCPSA in decontamination (53 feet 3 ) feed and output composition (mol %). The feed was 480 psi, 101 degrees Fahrenheit, and the exhaust was 65 psi.

[0090] The feed rate is about 10 MMSCFD.

[0091] Table 3a. Higher Purity

[0092] Step time (seconds) t F =0.583,t co =0.083,t CN = 0, t P =0.25,t RP =0.25

[0093] H2 purity 99.98%, recovery 86%

[0094] 86% recovery

[0095] Feed

product

Exhaust

H2

C1

C2

C3

C...

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Abstract

The management of hydrogen in hydrogen-containing streams associated with petrochemical process units wherein the hydrogen-containing stream is subjected rapid cycle pressure swing adsorption to increase the concentration of hydrogen therein.

Description

field of invention [0001] The present invention generally relates to catalytic reforming units and their use in catalytic reforming of naphtha. More specifically, the present invention relates to an improved catalytic reformer process capable of operating at higher throughput relative to compressor size. The present invention enables limited compressor reforming units to operate at greater capacity. Background of the invention [0002] Catalytic naphtha reforming is an established petroleum refining process. It is used to improve the octane quality of hydrocarbon feedstocks in the naphtha boiling range. In general, reforming refers to the total effect on the molecular changes of a hydrocarbon feedstock produced by a multitude of reactions. Typical reforming reactions include cyclohexane dehydrogenation, dehydroisomerization of alkylcycloheptanes, dehydrocyclization of paraffins and olefins, isomerization of substituted aromatics and hydrocracking of paraffins. Typically ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047C10G35/04C10G35/085C10G35/24C10G35/10
CPCC10G2300/1096C10G49/007C10G2400/30B01D53/0473Y02P20/129B01D53/047
Inventor 斯图尔特·S·戈尔德施泰因约翰·H·图尔泰尔巴尔·K·考尔格雷格·A·马歇尔
Owner EXXON RES & ENG CO
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