Continuous process for preparing hydrocarbon products through methanol transformation without standby reactor

A technology for the conversion of hydrocarbon products and methanol, which is applied in the continuous process field, can solve the problems of cumbersome operation of regeneration system control and actuators, increased investment in automatic control parts, and lower reliability of equipment operation, so as to simplify the automatic control part and improve stability performance and reliability, and the effect of reducing equipment investment

Active Publication Date: 2010-08-25
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI +2
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AI-Extracted Technical Summary

Problems solved by technology

[0006] 1. Since the standby reactor is always in the regeneration state or standby state, its production capacity cannot be exerted, resulting in waste of equipment production capacity and increased equipment investment;
[0007] 2. All reactors, including online reactors and standby reactors, need to set up...
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Abstract

The invention discloses a continuous process for preparing hydrocarbon products through methanol transformation without standby reactor. Two groups of reactors are arranged; the first group reactor works first, when a catalyst in the first group of reactor reaches metaphase of lifetime one way, the second group of reactor is started, so that the two groups of reactors are in the simultaneous working state and respectively bear 50 percent of reaction load; when the catalyst in the first group of reactor reaches last phase of the lifetime one way, a catalyst in the second group of reactor is positioned in the metaphase of lifetime one way, and at the moment, the total 100 percent of reaction load is transferred to the second group of reactor and the catalyst in the first group of reactor is regenerated; after the catalyst in the first group of reactor is regenerated, the first group of reactor works, and the two groups of reactors respectively bear 50 percent of reaction load; when the catalyst in the second group of reactor reaches the last phase of the lifetime one way, the catalyst in the first group of reactor is positioned in the metaphase of the lifetime one way, and at the moment, the total 100 percent of reaction load is transferred to the first group of reactor and the catalyst in the second group of reactor is regenerated; the process is repeated so as to realize reaction process continuity under the condition of no standby reactor. The continuous process has the advantages of not needing arranging the standby reactor, simplifying process flow, reducing equipment investment and improving system operation stability and reliability.

Application Domain

Technology Topic

ChemistryCatalyst regeneration +3

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  • Continuous process for preparing hydrocarbon products through methanol transformation without standby reactor
  • Continuous process for preparing hydrocarbon products through methanol transformation without standby reactor

Examples

  • Experimental program(2)

Example Embodiment

[0022] Example 1 takes the one-step methanol conversion to gasoline process in a fixed bed adiabatic reactor as an example, and uses the process flow shown in the drawings. The number of the first group of reactors 6 and the second group of reactors 7 is two, and each reactor is filled with 100kg of methanol conversion to gasoline catalyst (ZSM-5 molecular sieve catalyst). The reaction pressure was 1.6 MPa, the inlet temperature of each reactor was 320°C, and the outlet temperature was 410°C. The specific implementation steps are as follows.
[0023] 1. Turn on the first set of reactors
[0024] As shown in the process flow chart, when the first set of reactors (6) is started, the reaction material inlet valve (4) and reaction material outlet valve (8) of the first group of reactors (6) are opened, and the reaction material inlet valve of the second group of reactors (7) is closed. (5) The reaction material outlet valve (9), and the valves (11), (12), (13), (14) of the regeneration system are closed. The methanol flow rate from the raw methanol storage tank (1) is 200kg/h, and the methanol mass space velocity is 1.0h -1. Methanol is pumped into the heat exchanger (3) through the raw material pump (2) for heat exchange and temperature rise. After reaching the reactor inlet temperature requirement, it enters the reactor (6) through the reaction material inlet valve (4) of the first reactor (6) ), under the action of the catalyst, methanol is converted into a mixture of hydrocarbon products and water, and leaves the reaction system through the reaction material outlet valve (8) and pipeline (10) of the first reactor (6).
[0025] At this time, the second group of reactors (7) are in a state to be started, and the reactant load of the first group of reactors (6) is 50% of the total load under normal production conditions.
[0026] 2. Turn on the second set of reactors
[0027] When the first group of reactors (6) work to the middle of the single-pass life of the catalyst (the 11th day), open the material inlet valve (5) and material outlet valve (9) of the second group of reactors (7) to make the reaction material Pass the first group of reactors (6) and the second group of reactors (7) at the same time, and gradually increase the methanol flow to 400kg/h, at this time the reaction load reaches 100%, and the mass space velocity of methanol is 1.0h -1. The first group of reactors (6) and the second group of reactors (7) respectively bear 50% of the reaction load.
[0028] 3. The first reactor catalyst regeneration
[0029] When the catalyst in the first group of reactors (6) reaches the end of its one-way life (the 22nd day), close the material inlet and outlet valves (4) and (8) of the first group of reactors (6) to allow all the reaction materials to enter For the second group of reactors (7), all the reaction load is transferred to the second group of reactors (7). At this time, only the second group of reactors (7) are in working condition, and the second group of reactors (7) bears 100% response load. At this time, relative to the catalyst in the second set of reactors, the mass space velocity of methanol is 2.0h -1.
[0030] The valves (11) and (13) of the regeneration system of the first group of reactors (6) are opened, the regeneration gas is passed through the first group of reactors (6), and the catalyst in the reactor enters the regeneration process.
[0031] After the catalyst regeneration in the first group of reactors (6) is completed, close the valves (11) and (13) of the regeneration system of the first group of reactors (6), and turn on the feed of reaction materials in the first group of reactors (6). Outlet valves (4), (8), the first group of reactors are put into operation. At this time, the two sets of reactors are working at the same time, and all the reaction loads are equally distributed to the two sets of reactors, and each set of reactors bears 50% of the reaction load. At this time, relative to the catalysts in the first group of reactors and the second group of reactors, the mass space velocity of methanol is 1.0h -1.
[0032] 4. The second reactor catalyst regeneration
[0033] When the catalyst in the first group of reactors (6) enters the middle of its single-pass life (day 33), the catalyst in the second group of reactors (7) reaches the end of its single-pass life (at this time the catalyst in the second group of reactors has already Run for 22 days). At this time, close the inlet and outlet valves (5) and (9) of the reaction materials in the second reactor (7), and transfer all the reaction load to the first reactor (6). At this time, only The first group of reactors (6) is in working condition, and the first group of reactors (6) bears 100% of the reaction load. At this time, relative to the catalyst in the first group of reactors, the mass space velocity of methanol is 2.0h -1.
[0034] The valves (12) and (14) of the regeneration system of the second group of reactors (7) are opened, and the catalyst in the second group of reactors (7) enters the regeneration process.
[0035] After the catalyst regeneration in the second reactor (7) is completed, close the valves (12) and (14) of the regeneration system of the second reactor (7), and turn on the feed of the reaction materials in the second reactor (7). Outlet valves (5), (9), the second group of reactors (7) are put into operation. At this time, the two sets of reactors are working at the same time, and all the reaction loads are equally distributed to the two sets of reactors, and each set of reactors bears 50% of the reaction load. At this time, relative to the catalysts in the first group of reactors and the second group of reactors, the mass space velocity of methanol is 1.0h -1.
[0036] 5. Repeat steps
[0037] When the catalyst in the second set of reactors (7) enters the middle of the single-pass life, the catalyst in the first set of reactors (6) enters the end of the single-pass life again. At this time, repeat step 3, The catalyst in 6) is regenerated.
[0038] Similarly, when the catalyst in the second reactor (7) reaches the end of its single-pass life, the operation step (4) is repeated to regenerate the catalyst in the second reactor (7).
[0039] Repeating the operations of step 3 and step 4 can realize the continuity of the reaction process without a spare reactor.

Example Embodiment

[0040] Example 2 takes the conversion of methanol to prepare LPG as an example. The process flow shown in the figure is adopted. The number of the first group of reactors 6 and the second group of reactors 7 is 4, and each reactor is filled with 50kg of ZSM-5 molecular sieve catalyst for conversion of methanol to produce LPG, and the total amount of catalyst is 400kg. The methanol flow rate is 800 kg/h, the system pressure is 1.0 MPa, the inlet temperature of each reactor is 380°C, and the outlet temperature of each reactor is 510°C. Under the condition that reactor 6 and reactor 7 are working at the same time, the mass space velocity of methanol is 2.0h -1 , When one group of catalysts is in the regenerating state, relative to the working catalyst, the methanol mass space velocity is 4.0h -1. The specific implementation steps are the same as in Example 1.
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