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Preparation method for high-alkaline calcium naphthenate

A technology of calcium naphthenate and high alkalinity, which is applied in carboxylate preparation, petroleum industry, additives, etc., can solve the problems of weak acidity of large molecular weight naphthenic acid, destruction of colloidal structure of products, difficult control of reaction end point, etc., and achieves Good colloidal stability and high-temperature detergency, low viscosity and turbidity, and easy end-point control

Active Publication Date: 2013-09-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The prior art mainly has the following problems: one is that the acidity of large molecular weight naphthenic acid is relatively weak, and the neutralization reaction is more difficult; the other is that calcium hydroxide is easy to gather and settle into slag in an environment with a lot of water, thereby reducing the alkali value of the product , at the same time it will increase the viscosity and turbidity; the third is that the end point of the reaction is not easy to control, CO 2 A slight excess, the colloidal structure of the product will be destroyed, resulting in a large amount of precipitation

Method used

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  • Preparation method for high-alkaline calcium naphthenate

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Embodiment 1

[0034] In the reactor, add 150 milliliters of 120# solvent gasoline, 35 grams of 150SN neutral oil, 6 grams of ammonia solution of 10wt%, 10 grams of calcium hydroxide, 65 grams of naphthenic acid raw materials (pure acid value 118mgKOH / g, acid content 72 %), the reaction temperature is controlled at 45-60° C., and neutralized calcium naphthenate is generated after 60 minutes of neutralization reaction. Add 10 grams of calcium oxide, 20 grams of methanol, 20 grams of n-butanol, 4 grams of 10wt% ammonia solution, 4 grams of 25wt% NaCl solution, and feed carbon dioxide at a ventilation rate of about 80ml / min. When the 70% of carbon dioxide is 70%, add 10 grams of calcium oxide and 3 grams of 10wt% ammonia solution, feed carbon dioxide and carry out secondary carbonation reaction, when the absorption rate of carbon dioxide reaches 80%, the reaction ends. After the carbonation is completed, the temperature is raised to 120°C to distill dealcoholization and water. Add 100 millilit...

Embodiment 2

[0036] In the reactor, add 150 milliliters of toluene, 35 grams of 150SN neutral oil, 6 grams of potassium hydroxide aqueous solution of 10wt%, 10 grams of calcium hydroxide, 65 grams of naphthenic acid raw materials (pure acid value 118mgKOH / g, acid content 72% ), control the reaction temperature at 45-60°C, and neutralize the reaction for 60 minutes to generate neutral calcium naphthenate. Add 10 grams of calcium oxide, 20 grams of methanol, 20 grams of n-butanol, 2 grams of 10wt% potassium hydroxide aqueous solution, 4 grams of 25wt% NaCl methanol solution, and feed carbon dioxide at a ventilation rate of about 80ml / min. When reaching 70% of the theoretical value, add 10 grams of calcium oxide and 2 grams of 10wt% potassium hydroxide aqueous solution, feed carbon dioxide to carry out secondary carbonation reaction, when the absorption rate of carbon dioxide reaches 80%, the reaction ends. After the carbonation is completed, the temperature is raised to 120°C to remove alcoh...

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Abstract

The invention relates to a preparation method for high-alkaline calcium naphthenate. In the method, calcium hydroxide and calcium oxide are taken as calcifying agents, pure water is replaced by alkaline aqueous solution, and a mode of multiple addition is adopted to prepare a calcium naphthenate product with the base number of more than or equal to 350 mgKOH / g. The product has the advantages of low viscosity and turbidity and better high temperature cleanliness.

Description

technical field [0001] The invention relates to a preparation method of overbased calcium naphthenate. Background technique [0002] Overbased calcium naphthenate has good detergent dispersibility, oil solubility, diffusibility and acid neutralization ability, and is an excellent detergent and dispersant. It is not only widely used in medium and high-grade internal combustion engine oils, but also the first choice for marine cylinder oils performance improver. [0003] "Petroleum Refining" No. 4, 1991 reported "The Development and Application of DN250 Highly Alkaline Calcium Naphthenate", which mixed naphthenic acid, diluent oil, gasoline, water, methanol and lime for neutralization reaction; After the secondary calcification reaction, the accelerator and water are removed, and the solvent is evaporated after filtration to obtain a calcium naphthenate product with a base value of 250 mgKOH / g. [0004] Chinese patent CN1216027C introduces the preparation method of ultra-hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/41C07C61/00C10M129/46C10N40/25C10N30/04
Inventor 李玲段庆华刘依农
Owner CHINA PETROLEUM & CHEM CORP
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