57results about How to "Promote cleavage reaction" patented technology

The present invention discloses one kind of assistant for raising the yield of delayed coking liquid and its preparation process and application. The assistant consists of alkyl nitrate 20-40 wt%, fatty alcohol 10-30 wt%, dimethyl polysiloxane 10-20 wt% and solvent for the rest. The present invention can raise the yield of delayed coking liquid and reduce the yield of coke obviously.

The invention discloses a waste plastic molten salt cracking device. The waste plastic molten salt cracking device comprises a cracking furnace, the first end of the cracking furnace is provided with a molten salt outlet, the second end of the cracking furnace is provided with a molten salt inlet, a rotor feeder with a sealing function is arranged on an upper wall of the cracking furnace, a distributor is arranged on the position, close to the feeder, of the cracking furnace, the distributor is connected with a molten salt pump through a salt conveying pipe, all branch pipes of the distributor penetrate through the cracking furnace, a molten salt spray pipe is installed at the lower end of each branch pipe, the cracking furnace is provided with a tapered molten salt settling pond, the highest position of the upper wall of the cracking furnace is provided with a cracking gas outlet, and the molten salt outlet is connected with a molten salt furnace through a pipeline; the molten salt furnace is connected with the molten salt pump, one part of molten salt is sent to the second end of the sealed cracking furnace by the molten salt pump through the salt conveying pipe, and the other part of the molten salt is sent into the distributor. Due to the fact that the distributor is arranged, the heat transfer surface area is increased, the structure of the waste plastic cracking device is simplified, and the cracking efficiency is improved.

The invention belongs to a petrochemical industry, and provides an ethylene cracking furnace which comprises a high-pressure drum, a convection section, a radiation section, a quenching boiler and a combustor. Single-pass radiation furnace pipes are arranged in the radiation section and comprise inlet section straight pipes and bending pipe connectors, each bending pipe connector comprises two S-shaped bending pipes and an inlet straight pipe positioned between the two S-shaped bending pipes, a plurality of radiation furnace pipes form a large group, a plurality of large groups are arranged inthe radiation section, all radiation furnace pipes in each large group are connected with a shared collecting tube through the bending pipe connectors, outlet section straight pipes of the radiationfurnace pipes in each large group are vertically arranged relative to the bottom of the combustor, the convection section is connected with the collecting tube through a crossover pipe, and the crossover pipe is of a stereoscopic II-type structure distributed along the length, width and height directions of a furnace body of the radiation section. A distributed mode of the crossover pipe can ensure that a line of the crossover pipe has sufficient flexibility to absorb thermal expansion of the furnace pipes, so that bending of the furnace pipes is avoided.

The invention provides an ethylene cracking furnace of a double-section heat supply structure. The ethylene cracking furnace comprises a radiation section (1), a convection section (5), a radiation coiled tube (4), a quenching boiler (6), a high-pressure steam pocket (7) and a draft fan (8), wherein the quenching boiler (6) is connected with the radiation coiled tube (4); the draft fan (8) is connected with the top of the convection section (5); and the high-pressure steam pocket (7) is connected with the quenching boiler (6). The ethylene cracking furnace is of the double-section combined heat supply structure that the radiation section (1) is internally provided with an upper heat supply section and a lower heat supply section. By adopting the ethylene cracking furnace of the double-section heat supply structure, the arrangement of a combustor and the design of a combustion tube line arrangement are simplified, the flame inside a hearth is prevented from coiling to touch furnace tubes, interference of flame is also prevented, uniform distribution of heat in the height direction inside the hearth in the radiation section is maintained, and meanwhile the emission of NOx is reduced.

The suppression of coke adherence in a reaction vessel and cracked gas pipelines at the outlet of the reaction vessel and the prevention of plugging are designed by improving the dispersion of superheated steam inside the reaction vessel to preferable conditions, and pitch having more uniform and higher quality can be produced.A cracking process in which superheated steam is directly contacted with the heavy petroleum oil by blowing the superheated steam into the reaction vessel to be thermally cracked to oil fractions and pitch, wherein the superheated steam is blown into the reaction vessel from the bottom portion thereof so that the superheated steam generates rotational flow around the central axis of the shell of the reaction vessel.

The invention relates to a method for preparing fluorinated alkene by high temperature wet-cracking, belonging to the field of organic synthesis. The method is characterized in that under the condition of normal pressure and the temperature of 600-1000DEG C, hydrogen fluoride alkane with the molecular formula of HnFmC3 (n +m=8, n is more than or equal to 1 and less than or equal to 8, and m is more than or equal to 2 and less than 8) is taken as raw gas to have cracking reaction in the environment of water vapor or ammonia water vapor; no catalyst is used in the method, so that the generation cost is reduced, by-products are few, the selectivity of the product is high, subsequent purification and separation are convenient, the whole technique is easy to control, and the method is very suitable for producing the fluorinated alkene in industrialization-scale.

The invention belongs to the field of the biological energy utilization, and provides a device and a method for preparing oil by co-catalytically pyrolyzing forestry and agricultural wastes and algae in a sectional manner. The method comprises the following steps: mixing algae powder and forestry and agricultural waste powder to form a raw material, soaking HZSM-5 powder in a precursor solution containing gallium, and then soaking in a precursor salt solution containing nickel or silicon to obtain a composite catalyst; enabling carrier gas to enter from top of a heating section I; conveying the raw material to the heating section I by virtue of a spiral conveyor, enabling a non-condensed gas to rise to a projection section of the heating section I, placing the catalyst on a catalyst cushion layer of the projection section, after the pyrolysis is finished, turning an insert plate for 180 degrees, enabling the low-temperature product to fall into a heating section II, and enabling the carrier gas to enter from the bottom of the heating section II. A projection section at an outlet of the heating section II is provided with a cushion layer of self-made composite catalyst. The reaction residual coke is collected into a collection tank by virtue of an overturning stainless steel carrier net, and volatile components are collected into a liquid collector after being condensed. The low-oxygen high-quality biological oil is generated by utilizing the process, so that the conversion efficiency can be increased, and the carbon deposit deactivation of a molecular sieve can be effectively reduced.