• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    1454019 1,5-Dimethyltetralin SUN VENTURES Inc 31 Oct 1974 [31 Oct 1973] 47115/74 Heading C5E 1,5 - Dimethyltetralin is prepared by isomerizing 5-0-tolypentene-2 in a fixed bed adiabatic reactor containing an acidic catalyst, a portion of the product being cooled and recycled to the reactor to maintain the reactor temperature below 600‹ F. The catalyst may be phosphoric acid supported on kieselguhr. The temperature of the recycle-diluted feed at the reactor inlet may be 350-425‹ F.
    公开号:SU741791A3
    申请号:SU742070994
    申请日:1974-10-30
    公开日:1980-06-15
    发明作者:М.Чонг Виктор
    申请人:Сан Венчерс Инк (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to petrochemistry, specifically to a method for producing cyclic paraffin — 1,5-dimethyltetralin (1,5-DMT). 1,5-DMT is a semi-product for a number of petrochemical processes, in particular, a feedstock in the preparation of polyethy- ros. lots, cation exchange resins. The process is carried out at 200-300 ° C in a multi-tubular reactor 1. The disadvantages of this method are the use of expensive equipment, in particular a multi-tubular reactor, the formation of by-products, such as polymers, thereby reducing the service life of the catalyst. The aim of the invention is to simplify the process technology. Sing, the goal is achieved by the described method of obtaining 1, tiltetralin by cyclization of 5-0-tolylpentene-2 in the presence of an acid catalyst, at a temperature in the reactor 202-2 OO With recirculation 415 volumes of the reaction product per 1 volume of 5- 0-tolylpentene-2. It is preferable to conduct the process at a temperature in the reactor of 212-232 ° C. The proposed method for converting 5-0-talilpentene-2 to 1,5-DMT is carried out in a fixed bed adiabatic reactor. A quantity of 1,5-DMT is cooled and then recycled and mixed with the 5-0-tshilpenten-2 feed to the reactor. The return of the cooled product serves to control the temperature in the reactor, thereby eliminating the need for direct cooling in the reactor-. The reactor contains a fixed catalytic layer, which is located opposite to the multi-tubular heat exchanger reactor. There is no ket cooling inside the reactor and many layers can be provided; KOTOi i. Is often used in chemical reactions. Phosphoric acid on a carrier is preferably used as catcher of the process, but "5th other solid acid cyclization catalyst can also be used.
    .5-0-tolylpentene-2, obtained from 0-xylene and butadiene in the presence of an alkaline type catalyst, is fed through pipes to the reactor. In the absence of a return product, the raw materials are fed to the reactor through a bed of catalyst and 1,5-DMT is obtained. 1,5-DMT is removed and cooled by a circulating cooler. A refrigerator is any type of cooling device, for example a multi-tube heat exchanger, a cooling tank with coils. A cooled backflow flows through the line through the pump, the valve, where it is mixed with the feed 1 "1M & 0-tolylpentene-2. Then the mixture enters the reactor. The valve regulates the amount of cooled recirculated flow or flow, flow temperature 149-ZBO C, preferably 163– 232 ° C, and preferably 177-219 C. The volume ratio is the ratio of the volumes of the product recycled to the volumes of the fresh flow (5.0- The tolylpentene-2) is 1-50, preferably 4-15, preferably about 10. The amount of recycled stream is selected in order to maintain an elevated temperature in the reactor. The maximum temperature should not exceed 3l6 ° C, it is preferable to maintain it no more than 26Q ° C, preferably not more than 212-232 C. The liquid hourly space velocity in the reactor fMi the volume of the catalyst is usually 0.1-5, preferably 0.5-1 , {mostly about 0.2. The fresh feed (in wt.% Of the reactive 5-0-tolylpentene-2) is 75%, preferably 90%, preferably 95% and the selectivity (in wt.% Of the reactive 5-0-tolylpentene-2, which forms 1,5- or 1,6-DMT) is 80%, preferably 85%, preferably about 90%.
    The reaction is carried out at 95-100% conversion. A 10: 1 ratio of a recycler gives an increase in temperature in the reactor of approximately 7.2 ° C, while a 4: 1 ratio gives an increase of approximately c. , Examples 1-7. In each example, a tubular reactor 2.5 cm in diameter / filled with phosphoric acid catalyst on a carrier was used. The feed is mixed with the recycle liquid and fed to the reactor from the bottom at a constant space velocity. The reaction product is taken from the top and cooled recirculated portion. Ricecooled cooled to the same temperature as the fresh feed. The temperature of the reactor is measured at the outlet of the reactor. I In tab. 1 shows the operating conditions: product anapis, conversion and selectivity.
    : Similarly, 1,5-dimethyltetralin is obtained by cyclization from 5-0-tolyl. Experimental data and the achieved results of examples 3-7 are given in table. 2
    Table 1
    Temperature, C, Maximum temperature, 5-0-tolylpentene-2, g, Temperature in the reactor, s195-202 232 Hourly velocity, liquids, SV - Recycling ratio
    177
    177
    权利要求:
    Claims (2)
    [1]
    . . t a b l and c a 2 0.19 7-15, 5.6 199531922660 232204260 0.250.4. 0.4 7,010,010,0 Claim 1. The method of producing 1,5-dimethyl tetanum by cyclization of 5-0-tolylpentene-2 in the presence of an acid catalyst at elevated temperature in the reactor is characterized in that, in order to simplify the process, the process is carried out temperature in the reactor 202-260 ° С with recirculation Continued by table 2 with 4-15 volumes of the reaction product per 1 volume of 5-0-tolylpentene-2
    [2]
    2. Sysubo POP.1, characterized in that the process is carried out at a temperature in the register 212232 ° C. Sources of information taken into account in the examination. i. US patent 3244758. CL.260-671A, published.19bb (prototype).
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    同族专利:
    公开号 | 公开日
    GB1454019A|1976-10-27|
    IT1031028B|1979-04-30|
    NL7413910A|1975-05-02|
    BE821612A|1975-04-29|
    JPS5082048A|1975-07-03|
    US3843737A|1974-10-22|
    FR2249862A1|1975-05-30|
    CA1034960A|1978-07-18|
    FR2249862B1|1978-06-09|
    JPS568806B2|1981-02-25|
    DE2450154A1|1975-05-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS5125017B2|1971-08-31|1976-07-28|JPS51108045A|1975-03-03|1976-09-25|Sun Ventures Inc|
    US3997616A|1975-06-27|1976-12-14|Teijin Limited|Process for the preparation of alkylteralins|
    US4950825A|1988-06-24|1990-08-21|Amoco Corporation|Preparation of a dimethyltetralin|
    EP1031550B1|1999-02-22|2003-05-07|Mitsubishi Gas Chemical Company, Inc.|Process for producing dimethyltetralin|
    JP5512083B2|2007-12-18|2014-06-04|日揮株式会社|A method for controlling a reaction rate inside a reactor, a reaction apparatus, and a method for producing dimethyl ether.|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US00411536A|US3843737A|1973-10-31|1973-10-31|Adiabatic recycle design for exothermic heterogeneously catalyzed reactions|
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