Delayed coking defoaming agent and preparation method and application thereof

Abstract

The invention relates to a delayed coking defoaming agent and a preparation method and application thereof. The defoaming agent comprises the following components in percentage by weight: 5 to 15 percent of isooctanol, 15 to 30 percent of polyether modified silicon oil, 5 to 15 percent of decyne diol, 1 to 10 percent of nonyl phenol (n=10) ether phosphate, and 30 to 70 percent of No.200 solvent oil. The sum of the weight percentages of the components is 100 percent. The silicon content of the defoaming agent is less than 3 percent; the defoaming agent is used for a delayed coking technology; under the condition that the adding quantity of the defoaming agent is 15 to 40ppm, the height of a foam layer can be effectively reduced by 2.5 to 3 meters; and the defoaming agent has an excellent foam inhibiting effect, so that the adding quantity of the defoaming agent is reduced, and the coking cycle of a coke tower is prolonged.

Description

technical field [0001] The invention belongs to the field of petrochemical industry and relates to a defoamer, in particular to a defoamer used for treating foam layers in a coke tower of a delayed coking unit in an oil refinery, a preparation method and application thereof. Background technique [0002] Delayed coking is a process in which heavy residual oil is converted into gas, gasoline, diesel oil, wax oil and coke by deep cracking and condensation reaction after heating. During the reaction process of the coke tower, it can be divided into three main areas according to its height, the lower part is the coke layer; the middle part is the high-viscosity colloidal asphaltene, called the foam layer; the upper part is the oil and gas layer. The operation requires that the foam layer should be lower than the safe height of the coke tower, so the problem of the foam layer in the coke tower has become the bottleneck of the delayed coking process, and the existence of foam has ...

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Problems solved by technology

[0004] Patent CN1919439 proposes a defoamer for delayed coking coke tower, its components are polymethylsiloxane 30-40%, polyether fatty acid ester 30-50%, organosilicon compound 20-30% It is directly mixed, and the defoaming height can reach 3m, which improves the yield of light oil; the disadvantage is that the high silicon content makes the downstream catalyst more likely to be poisoned

[0005] Patent CN101045880 proposes an additive containing 30-50% high-molecular-weight block polyether, 20-40% fatty alcohol and 20-40% solvent, which is used to suppress the generation of foam in delayed coking coke towers, but the disadvantage is that all Need to add a lot