37results about How to "Reduce hydrothermal deactivation" patented technology

The invention belongs to the technical field of low-carbon olefin preparation, and discloses a method for improving the selectivity of low-carbon olefin preparation using oxygen-containing compound converting. The method comprises the following steps: feeding a regenerated catalyst from a regenerator into a pre-hydrocarbon pooling facility, making the regenerated catalyst contact an activation medium, carrying out a pre-hydrocarbon pooling reaction to form a hydrocarbon pool active species, feeding the pre-hydrocarbon pooling regenerated catalyst leaving the pre-hydrocarbon pooling facility into a conversion reactor, and recycling. According to the invention, the pre-hydrocarbon pooling facility is arranged, and the regeneration catalyst is subjected to pre-hydrocarbon pooling treatment, so that the regenerated catalyst forms the hydrocarbon pool active species and the carbon deposit before entering the conversion reactor, and the hydrocarbon pool active species distribution and the carbon deposit distribution of the catalyst in the conversion reactor are improved so as to shorten or eliminate the induction period of the conversion reaction and improve the catalytic activity and the selectivity of the reaction for preparing the low-carbon olefin from the oxygen-containing compound serving as the regenerant.

The invention relates to a method for preparing aromatics by catalytic conversion of methanol, which mainly solves the problems of low yield of aromatics and serious hydrothermal deactivation of catalysts in the prior art. In the present invention, the methanol raw material enters the fluidized bed reactor and the modified ZSM-5 catalyst is contacted and reacted to obtain the product containing aromatics and the unborn catalyst, and the unborn catalyst after stripping enters the riser regenerator and contacts the regeneration medium I at 500~ Burned under the condition of 600 ℃, the outlet of the riser regenerator is connected with at least one set of closed cyclone separators, and the semi-regenerated catalyst separated by the closed cyclone separators enters the fluidized bed regenerator and contacts regeneration medium II at 630~ The technical scheme of continuing to burn at 700°C to obtain a regenerated catalyst, the regenerated catalyst entering the degassing tank, and the degassed product returning to the fluidized bed regenerator solves this problem well and can be used in the industrial production of aromatics.

A process using the reactor with dual reaction regions for catalytic conversion of petroleum hydrocarbon includes reaction between raw material of gasoline, prelifted medium and catalyst in fluidized-bed reactor to generate the mixture of oil gas and catalyst, flowing upward into lifting-tube reaction region, reaction between raw hydrocarbon oil and said mixture to generate the mixture of oil gas and catalyst, separating oil gas from catalyst with carbon deposit in settling unit, further separating the oil gas, and regenerating catalyst.

The invention discloses a catalytic cracking unit. The catalytic cracking unit mainly comprises a heavy oil descendent tube reactor, a light hydrocarbon descendent tube reactor, a precipitator, a riser regenerator, a turbulent bed regenerator and the like, wherein the turbulent bed regenerator is communicated with the precipitator respectively through the heavy oil descendent tube reactor and light hydrocarbon descendent tube reactor; the precipitator is communicated with the riser regenerator; and the riser regenerator is communicated with the turbulent bed regenerator. The unit can improve the catalytic cracking product distribution, enhance the light oil yield and lower the yield of the cracked gas and coke; the unit can be used for producing low-olefin-content catalytic gasoline and high-cetane-number catalytic diesel; and the unit enhances the charring efficiency and decelerates the hydrothermal inactivation of the catalyst.