Start-up method of alcohol ether to olefin reaction-regeneration unit
A start-up method and a technology for a regeneration device, which are applied in ethylene production, hydrocarbon production from oxygen-containing organic compounds, and biological raw materials, etc., can solve problems such as the need for improvement in the start-up method, low hydrocarbon pool concentration, and long start-up process, so as to shorten the start-up time. , the effect of improving economic efficiency and increasing the temperature of the reactor
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Embodiment 1
[0086] The methanol-to-olefins reaction was carried out in a fixed-bed microreactor, using SAPO-34 molecular sieve as a catalyst, and the ratio of silicon to aluminum in the molecular sieve skeleton was 0.24. The reaction temperature is 350 degrees centigrade, and the reaction pressure is normal pressure. When methanol is fed alone, the concentration of feed methanol is 7.2mol%. 2 As a diluent, the weight space velocity of methanol is 26gMeOH / gCat. / h. When methanol is co-feed with ethylene, propylene or butene (1-butene was used in the test), maintain the feed methanol concentration and space velocity constant, add 2.0mol% ethylene or 1.3mol% propylene or 1.0 mol% butene to ensure the same carbon-based concentration of reactant olefins in the feed. The gas phase material composition at the outlet of the reactor was measured by gas chromatography, methanol and dimethyl ether in the outlet material were regarded as unconverted raw materials, and the conversion rate was calcula...
Embodiment 2
[0093] Alcohol ether to olefin is an exothermic reaction process. In order to maintain the reaction temperature, industrial MTO or DTO reactors need to be equipped with heat exchange facilities to remove the heat of reaction. However, in the start-up stage of industrial devices, the reactor usually cannot reach the normal operating temperature (eg: 400-475 degrees Celsius), and a large amount of energy consumption is required to preheat the raw materials and the reactor. Using the heat of reaction to elevate the reactor from a lower temperature (such as 250 degrees Celsius) to a predetermined reaction temperature (such as 400-475 degrees Celsius) is a feasible idea for starting up. Knowing the low-temperature reaction and exothermic performance will help to design a reasonable start-up plan. In this example, thermogravimetric-differential thermal analyzer (TG-DSC) was used to investigate the exothermic conditions of methanol conversion catalyzed by catalysts with different aci...
Embodiment 3
[0097] DME to light olefins reaction-regeneration system. Both the reactor and the regenerator are fluidized beds, and the catalyst is SAPO-34 molecular sieve. After the inspection of the airtightness of the device is ready, enter the start-up process. Fuel gas is fed into the auxiliary combustion chamber, and the combustion of the fuel gas heats the regenerated air, and the hot air enters the regenerator to fluidize and heat up the driving agent added to the regenerator. The driving agent is a SAPO-34 molecular sieve catalyst with high acid density, and the silicon-aluminum ratio of the molecular sieve framework is 0.36. The particle size distribution, density and abrasion strength of the catalyst meet the requirements for use in fluidized bed reactors. When the temperature of the regenerator rises to 380 degrees Celsius, light diesel oil is injected into the regenerator, and the temperature of the regenerator is accelerated to 500 degrees Celsius by using diesel combustion...
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