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Method for producing lubricant detergents

An oil-soluble, catalyst technology, applied in the preparation of organic compounds, lubricating compositions, carboxylate preparations, etc., can solve problems such as side reactions and corrosion

Inactive Publication Date: 2008-07-09
CROMPTON CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the unfavorable economic effects of the application of high temperature and / or pressure, the Kolbe-Schmitt route to alkylated salicylic acid has the following problems: when mainly linear alkylation feedstocks are used, not all long-chain alkylphenols are can be carboxylated
Both documents report that the use of sulfuric acid as a catalyst is undesirable (in processes not involved in the prior art for the alkylation of acids with olefins) as this has a number of disadvantages such as corrosion problems and side reactions

Method used

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  • Method for producing lubricant detergents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Alkylation of salicylic acid

[0103] Salicylic acid (215.0 g) was added to a 3 L glass vessel equipped with a stirrer, thermometer and heating mantle. Next add the mixed C 14 -C 18 Olefin (367.7 grams), then an alkylation catalyst such as 45.1 grams of methanesulfonic acid is added. The mixture was heated to 120°C and maintained at this temperature for 24 hours. Some VM&P naphtha (582.6 grams) was then added and the clear solution was allowed to settle to remove spent catalyst. The recovered product is a clear yellowish alkyl salicylic acid diluted with naphtha, suitable for direct overbased or reaction with pre-overbased detergents.

Embodiment 2

[0105] Preparation of Calcium Salicylate

[0106] To a reaction vessel containing 20 grams of VM&P naphtha, 15 grams of base oil and 20 grams of methanol was added 35 grams of 500 TBN calcium sulfonate. Once thoroughly mixed, 100 grams of the alkyl salicylic acid described in Example 1 was slowly added, raising the temperature to 420°F (about 216°C) over the next two hours. The stripped calcium salicylate was bright and clear with a viscosity of 45 centistokes, a TBN of 170, and a calcium percentage of 6.1%.

[0107] The product of Example 2 was tested in PDSC (Differential Pressure Scanning Calorimetry) and found to have an induction time of 109 minutes. The OIT of the corresponding calcium sulfonate is lower than 30 minutes.

[0108] The same product was subjected to a high temperature cleaning test using a painted panel coker test and found to have 3.5 mg of deposits. Used as an alkali source (CaCO 3 ) of the corresponding overbased sulfonate had 75 mg of deposition.

...

Embodiment 3

[0111] Preparation of Calcium Salicylate

[0112] 140 grams of the alkyl salicylate prepared in Example 1 was added to the reactor, followed by 50 grams of base oil, 220 grams of VM&P naphtha, 9 grams of methanol, 7.5 grams of neutral calcium sulfonate and 23 grams of hydrated lime . Heat the mixture to 140°F (60°C) and add CO 2 , until the lime is converted to CaCO 3 . The reaction mixture was filtered and distilled, yielding a bright and clear calcium salicylate cleanser fluid.

[0113] The PDSC test showed an OIT of 140 minutes and the painted panel coker test showed good cleaning performance with 8.5 mg deposits.

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Abstract

The invention is a process for producing alkaline earth metal salicylates for use as lubricant detergents and to compositions prepared by the process. The process comprises two steps. Step 1 is the alkylation of salicylic acid is conducted using C<14> or greater linear alpha-olefins to produce alkyl salicylic acids in commercially acceptable yields. The alkylation conditions produce predominately mono-substituted para alkyl salicylic acids that are oil soluble. Step 2 is the oil soluble acid is subsequently neutralized and overbased by carbonation of lime using CO<2> in the presence of a promoter and a surfactant. The reaction mixture after overbasing is filtered and solvents are removed by distillation. Alternatively, alkyl salicylic acid can be reacted with a previously overbased alkaline earth sulfonate, e.g., calcium sulfonate, to produce alkaline earth salicylate salts comprising varying percentages of dispersed alkaline earth carbonate salts. In this method, no filtration of the end product is required, and, thus, it is commercially preferred.

Description

technical field [0001] The present invention relates to a process for the preparation of overbased alkaline earth metal cleaners for lubricating oils. Background technique [0002] The use of alkaline earth metal salts of organic carboxylic acids as additives to lubricating oil compositions is known. These salts have dispersant properties that help ensure that the interior of the engine cylinder remains clean and eliminate deposits of carbonaceous products on the piston and in the piston grooves, thereby preventing piston ring sticking. [0003] It is also known to prepare basic (or overbased) alkaline earth metal salts of these acids. Overbasedness provides an alkaline reserve that, when applied in a lubricating oil composition, reacts with and neutralizes acidic compounds formed during operation of the engine in which the composition is applied. Thus, any sludge that may be generated is dispersed due to the dispersant properties of the salt, while those acids which might...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/41C07C51/353C10M159/20C10M159/22
Inventor R·J·缪尔
Owner CROMPTON CORP