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A method for co-producing p-xylene from low-carbon olefins
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A technology of p-xylene and low-carbon olefins, applied in the field of chemical industry, can solve the problems of cumbersome, complicated process, and low PX yield
Active Publication Date: 2020-08-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
The disadvantages of the above-mentioned technology are that the toluene conversion rate is low (~20%), the PX yield is low, and the conversion rate of methanol is not mentioned; the catalyst preparation process needs to carry out multiple modification and roasting processes, and the process is complicated and loaded down with trivial details
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[0086] 100g HZSM-5 zeolitemolecular sieve raw powder (Nankai University Catalyst Factory, Si / Al=30) was calcined in air atmosphere at 550°C for 4 hours, then pressed into tablets, crushed, and sieved to obtain 40-60 mesh particles. Molecular sieve particles, denoted as FXHZSM-5-A.
[0087] 100g HZSM-5 zeolite molecular sieve raw powder (Nankai University Catalyst Factory, Si / Al=5) was calcined in an air atmosphere at 550°C for 4 hours, then pressed into tablets, crushed, and sieved to obtain 40-60 mesh particles. Molecular sieve particles, denoted as FXHZSM-5-B.
[0088] 100g HZSM-5 zeolite molecular sieve raw powder (Nankai University Catalyst Factory, Si / Al=10) was calcined in air atmosphere at 550°C for 4 hours, then pressed into tablets, crushed, and sieved to obtain 40-60 mesh particles. Molecular sieve particles, denoted as FXHZSM-5-C.
Embodiment 2
[0089] Example 2 Preparation of HZSM-11 shaped molecular sieve sample for fixed bed
[0090] 100g HZSM-11 zeolite molecular sieve raw powder (Nankai University Catalyst Factory, Si / Al=35) was calcined in air atmosphere at 550°C for 4 hours, pressed into tablets, crushed, and sieved to obtain 40-60 mesh particles. Molecular sieve particles, denoted as FXHZSM-11-A.
[0091] 100g HZSM-11 zeolite molecular sieve raw powder (Nankai University Catalyst Factory, Si / Al=12) was calcined in air atmosphere at 550°C for 4 hours, pressed into tablets, crushed, and sieved to obtain 40-60 mesh particles. Molecular sieve particles, denoted as FXHZSM-11-B.
[0092] Example 3 Preparation of HZSM-5 shaped molecular sieve sample for fluidized bed
[0093] 100g of HZSM-5 zeolite molecular sieve former powder (Nankai University Catalyst Factory, Si / Al=30) is mixed with aluminum or silicon-containing amorphous binder and spray-dried to form. The specific steps are:
[0094] Mix the original powde...
Embodiment 4
[0097] Example 4 Preparation of HZSM-5 shaped molecular sieve sample for fluidized bed
[0098] The specific preparation conditions and steps are the same as those in Example 3, except that the raw material HZSM-5 zeolite molecular sieve raw powder is used in an amount of 10 kg, and the particle size distribution of the obtained microsphere particle sample is 20-120 μm, and the abrasion index is 1.2, which is recorded as FLHZSM -5-B.
[0099] The specific preparation conditions and steps are the same as in Example 3, the difference is that the raw material HZSM-5 zeolite molecular sieve powder has a silicon-aluminum ratio of Si / Al=10, the obtained microsphere particle sample particle size distribution is 20-100 μm, and the wear index is 1.2, denoted as FLHZSM-5-C.
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Abstract
This application discloses a method for co-producing p-xylene from low-carbon olefins, which is to convert the C in the methanolconversion reaction product 5+ The chain hydrocarbon components are further subjected to cracking, shape-selective aromatization and other reactions to effectively increase the yield of low-carbon olefins and p-xylene. By dividing the reaction into two reaction zones, and selectively to C 5+ The chain hydrocarbon components are smelted back to one of the reaction zones, which effectively increases the yield of light olefins and p-xylene, and further improves the overall economic benefits. The conversion rate of methanol is 100%, and the selectivity of p-xylene in xylene is as high as 99.6wt%. The phosphorusreagent and the silylating reagent are contacted with the molecular sieve in the reactor, and the catalyst for the co-production of p-xylene from methanoltoluene to low-carbon olefins is prepared in situ; the reactor is the co-production of p-xylene from methanol toluene of the reactor. The method simplifies the entire chemical production process by directly preparing the catalyst in the reaction system, saves catalyst preparation and transfer steps, and is easy to operate.
Description
technical field [0001] The application relates to a method for co-producing p-xylene from methanol toluene to light olefins, which belongs to the field of chemical engineering. Background technique [0002] Olefins are the core of the petrochemical industry. Among them, ethylene is the most consumed basic chemical product. Its main purpose is to produce polyethylene (PE). In 2013, the global polyethyleneraw material accounted for 60% of ethylene production; propylene and ethylene are similar , is also an important basic chemical raw material, and its largest use is to produce polypropylene (PP). In 2010, polypropylene consumption accounted for 65% of the total demand for propylene. In addition, ethylene and propylene are important platform compounds in the modern chemical industry. Many chemical products can be produced from ethylene and propylene, forming a huge industrial chain. Paraxylene (PX) is a raw material for the production of polyesters such as PET (polyethylene ...
Claims
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Application Information
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