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A scale inhibitor, oil slurry technology, used in the petroleum industry, hydrocarbon oil treatment, treatment equipment corrosion/fouling inhibition, etc. Effect
Inactive Publication Date: 2019-03-22
JIANGSU KECHUANG PETROCHEM
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[0003] Existing antiscalants generally contain metal surface passivation agents, which are mainly metal salts. Antiscalants containing these components will affect the ash index of later products, which will reduce the quality of products. Antiscalants that do not contain metal salts appear, so this problem cannot be avoided
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Embodiment 1
[0036] A kind of oil slurry antiscalant, comprises the component of following mass fraction: polyisobutylene succinimide (cleaning dispersant) 30%, 2,6-di-tert-butyl-1-dimethyl-p-cresol (phenol Amine type antioxidant) 10%, benzimidazole mercaptan (corrosion inhibitor) 5%, detergent T107 0.8%, metal passivator THMD-5 0.5%, the balance is xylene and diesel oil mass ratio 10:1 mixed solvents.
[0037] At a temperature of 40°C, add a cleaning and dispersing agent to the solvent. After it is completely dissolved, add detergent T107, 2,6-di-tert-butyl-1-dimethyl-p-cresol, and metal deactivator THMD-5 in sequence. , benzimidazole mercaptan, stir evenly to obtain oil slurry scale inhibitor, freezing point -14.1°C, kinematic viscosity (20°C) 42.6mm 2 / s.
Embodiment 2
[0039]A kind of oil slurry antiscalant, comprises the component of following mass fraction: polyisobutylene succinimide (cleaning dispersant) 30%, polybutadiene hexylene glycol thiophosphate (cleaning dispersant) 3%, 2,6-di-tert-butyl-1-dimethyl-p-cresol (phenolic amine antioxidant) 10%, benzimidazole thiol (corrosion inhibitor) 5%, detergent T107 0.8%, metal passivation Agent THMD-50.5%, the balance is a mixed solvent of xylene and diesel oil with a mass ratio of 10:1.
[0040] The preparation method is the same as in Example 1. The resulting oil slurry scale inhibitor has a freezing point of -14.2°C and a kinematic viscosity (20°C) of 42.9mm 2 / s.
Embodiment 3
[0042] A kind of oil slurry antiscalant, comprises the component of following mass fraction: polyisobutylene succinimide (cleaning dispersant) 32%, polybutadiene hexylene glycol thiophosphate (cleaning dispersant) 4%, 2,6-di-tert-butyl-1-dimethyl-p-cresol (phenolic amine antioxidant) 10%, benzimidazole thiol (corrosion inhibitor) 5%, detergent T107 0.8%, metal passivation Agent THMD-50.5%, the balance is a mixed solvent of xylene and diesel oil with a mass ratio of 10:1.
[0043] The preparation method is the same as in Example 1. The resulting oil slurry scale inhibitor has a freezing point of -13.5°C and a kinematic viscosity (20°C) of 42.4mm 2 / s.
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Abstract
The invention discloses an oil slurry scale inhibitor. The oil slurry scale inhibitor is prepared from the following components in percentage by mass: 25 to 40 percent of a detergent dispersant, 6 to12 percent of a phenol-amine type antioxidant, 5 to 10 percent of a corrosion inhibitor, 0.5 to 3 percent of a detergent, 0.4 to 0.5 percent of a metal passivating agent and the balance of a solvent,wherein the detergent dispersant is polyisobutylene succinimide and / or polybutadiene mercaptohexanediol phosphate. The oil slurry scale inhibitor disclosed by the invention has a low freezing point (less than or equal to -15 DEG C), small viscosity (the kinematic viscosity is less than or equal to 50 mm<2> / s at 20 DEG C), a strong anti-oxidization capability and good thermal stability; propertiesand utilization performance of the oil slurry scale inhibitor are not influenced at relatively high temperature of 350 to 400 DEG C and the oil slurry scale inhibitor is suitable for scale inhibitionand descaling in an oil slurry system in a catalytic cracking device; the adding amount of the oil slurry scale inhibitor in oil slurry is 30 to 100 ppm; the oil slurry scale inhibitor can be used foreffectively inhibiting equipment including the oil slurry system, a pipeline, a heat exchanger and the like from being coked; the scale inhibition rate can reach 90 percent and safe and stable operation of a device is ensured.
Description
technical field [0001] The invention relates to a scale inhibitor, in particular to an oil slurry scale inhibitor for preventing scaling and coking of oil slurry system equipment during catalytic cracking of raw oil. Background technique [0002] Catalytic cracking is one of the important devices in refineries. In recent years, with the continuous improvement of catalytic cracking technology and the improvement of petroleum processing depth, the proportion of blended residual oil has been increasing, and the raw materials of catalytic cracking have become more and more complex and heavier. Due to the deterioration of the properties of the raw material oil, the condensation products of polycyclic aromatic hydrocarbons and catalyst particles formed during the processing are deposited in the oil slurry system, and the fouling and coking of the equipment in the oil slurry system lead to a decrease in the thermal efficiency of the oil slurry heat exchanger, which affects the norm...
Claims
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