CN1180691A - Method for one-step manufacture of stannous caprylate - Google Patents

Abstract

A process for preparing stannous octanoate features that rich and cheap soda, instead of traditionally used caustic soda, along with isooctanoic acid, stannous chloride and extracting solvent, takes part in synthesizing procedure including saponification, transformation and extraction in same reactor. The CO2 atmosphere generated by reaction is retained while inert gas and antioxidant are added for preventing oxidization. The synthesis is completed in optimal technological conditions. Obtained stannous octanoate has higher quality, stability and antioxidizing nature, and low cost.

Description

The method of one one-step manufacture of stannous caprylate

The present invention relates to a kind of manufacturing process of organotin, a particularly a kind of step is finished stannous 2-ethylhexoate, and (be commonly called as stannous iso caprylate, stannous octoate, its molecular formula is (C ₇H ₁₅COO) ₂Sn, molecular weight are 405.12) technology.Stannous octoate is a kind of lurid transparent liquid, have characteristics such as low, the active height of toxicity, excellent catalytic effect, be to produce requisite ideal catalyst of material such as Polyurethane plastics, coating and rubber at present in the world, be mainly used in polyurethane flexible foam production, or the good catalyst of room temperature cure silicon rubber and the water white transparency promotor of unsaturated polyester, and be widely used in plastics, foam article, and as civil goods such as spfa cushion, mattresses, chemical industry such as rubber, light industry and other industry.

Developed country just takes to the development research of organotin Chemicals from the forties, production technology level and quality product improve constantly, the range of application of product constantly enlarges, and driven developing rapidly of relevant chemical industry and light industry, wherein, with U.S. atropic company, U.S. aerification chemical product company, Switzerland ACTMA company is that starting is studied early to stannous octoate by some companies of representative, its synthesis technology level and quality product are higher, formed stable scale production, its product has been squeezed into China, and monopolize Chinese market substantially, wherein best with the product (T-9) of U.S. aerification chemical product company again, price is also the highest.China's development stannous octoate is started late, and the overall technology level is low, and quality product is compared with imported product, still has big gap so far, and unstable product quality, and many producers are the short run trial production, do not realize industrialization.

The synthetic of stannous octoate has several different methods owing to the raw material of selecting is different, and the method that extensively adopts both at home and abroad has following three kinds at present:

1, aldehyde disproportionation method: this method is to utilize the alkanoic have side chain to react with sodium hydroxide or alkali metal alcoholates (as 2-Ethylhexyl Alcohol sodium) under Connizzaro (Cannizzaro) reaction conditions and generate corresponding alcohol and carboxylate salt, produce stannous octoate then, but this method exists reaction conditions wayward, need under special conditions, to react, the equipment requirements strictness, the production cost height is bought problems such as raw material difficulty.

2, acid anhydrides method: this method is that 2 ethyl hexanoic acid and aceticanhydride are heated to 120 ℃ in toluene solution, add tin protoxide simultaneously, the acetic acid that generates and toluene boil jointly steam after, just can obtain stannous 2-ethylhexoate, there is the raw materials cost height in this method, and the complicated and aceticanhydride of subsequent disposal such as is difficult for producing at problem.

3, double decomposition: this method is to utilize 2 ethyl hexanoic acid and sodium hydroxide solution reaction to make 2 ethyl hexanoic acid sodium, generates stannous 2-ethylhexoate with the tin protochloride reaction again, and this method exists the tin transformation efficiency low, and the cost height is difficult to realize problems such as industrialization.

The objective of the invention is for overcoming the problem that above three kinds of methods exist, by experimental study, provide a kind of use raw material cheap and easy to get, reaction process and subsequent disposal are simple, and easy control of reaction conditions is to using equipment requirements simple and easy, the transformation efficiency height of tin, production cost is low, and good quality of product, stable can import substitutes and be easy to realize the novel method of industrialized manufacturing stannous octoate.

The objective of the invention is to reach by following approach: the present invention adopts single stage method to produce stannous octoate, on raw material, use price lower, in liberal supply and to be easy to realize that caustic soda (sodium hydroxide) that the soda (yellow soda ash) of suitability for industrialized production replaces traditional method to use carries out saponification synthetic, exactly isocaprylic acid, soda and tin protochloride, extraction solvent are put into same reaction vessel (still), under optimum process condition, one step was finished saponification-conversion-extraction building-up process, through liquid-liquid separation, remove water, organic phase obtains stannous octoate through underpressure distillation.

Optimum process condition of the present invention is:

1, in building-up process, the carbon dioxide gas atmosphere that keeps reaction to cause, and feed an amount of rare gas element and add an amount of oxidation inhibitor, to prevent the oxidation of stannous ion.

2, the optimum amount mol ratio of 2 ethyl hexanoic acid, tin protochloride and alkali is: 1: 0.4～0.70: 0.45～0.75.Adopt this optimum amount ratio, reaction is carried out relatively fully, and the transformation efficiency of tin is the highest, and raw material consumption is minimum.

3, synthesising reacting time: 5～20 minutes.

4, distillation temperature: be controlled at 105～145 ℃ and be advisable, in this temperature range, distill more complete, inferior tin content is also higher, and during temperature low excessively (＜105 ℃), the separated from solvent in the product is incomplete, the content of Ya Xi and total tin is all lower, easily causes inferior tin oxidation when temperature is too high.

5, oxidation inhibitor: the stannous octoate that adopts preferred No. 1 oxidation inhibitor to make, antioxidant effect is best, and its antioxygen property is better than the U.S. (T-9) product.

6, stirring velocity: find in test, increase stirring velocity and help successful reaction and carries out that rotating speed reduces or when stopping to stir, can produce a large amount of white tindihydroxide precipitations, test draws, and best stirring velocity is that per minute 300-400 changes.

The present invention compared with prior art has the following advantages:

1, the present invention is an one-step synthesis technology, has simplified operation and equipment.

2, because the caustic soda that adopts inexpensive soda to replace traditional method to use carries out saponification, and manufacturing cost is lower, raw material (soda) is in liberal supply, and is easy to realize industrialization.

3, because in building-up process, taked to add the oxidation that several measures such as an amount of oxidation inhibitor prevent stannous ion in the stannous octoate building-up process, make the good in oxidation resistance of stannous octoate, obviously be better than imported product.

The present invention is described in further detail by the following examples: the present invention is cheap, sufficient soda and the isocaprylic acid of easily purchasing, tin protochloride and extraction solvent are put into same reactor, make the carbon dioxide gas atmosphere that maintenance causes in the still, and feed an amount of rare gas element and add an amount of No. 1 oxidation inhibitor.The consumption mol ratio that adds isocaprylic acid, tin protochloride and soda in the reactor is: 1: 0.4～0.7: 0.45～0.75.Under 70 ± 20 ℃ of temperature, reacted 5～20 minutes, and stir with 300-400 rev/min, distillation temperature is controlled at 105-145 ℃, the applicant has produced the stannous octoate that quality reaches the imported product quality index fully by these conditions, and the stannous octoate that the applicant produces is at aspects such as stability and antioxidant properties, all obviously be better than imported product, therefore the stannous octoate of applicant's production can replace imported product fully, and formed the suitability for industrialized production ability, thereby the situation of the long-term dependence on import of stannous octoate that the China that is through with is required, for country saves a large amount of foreign exchanges, can promote plastics simultaneously, porous plastics, the development of related industries such as coating and rubber.The stannous octoate that the applicant produces contrasts as following table with the quality index of domestic and international product:

Claims (2)

1, the technology of a kind of one-step synthesis stannous 2-ethylhexoate (stannous octoate), it is characterized in that adopting yellow soda ash cheap and easy to get to replace the sodium hydroxide of traditional technology use, yellow soda ash, isocaprylic acid, tin protochloride and extraction solvent are packed in the same reactor, under optimum process condition, finish saponification-conversion-extraction building-up process, through liquid-liquid separation, remove water then, organic phase obtains stannous octoate through reduced pressure distillation again.

2, single stage method as claimed in claim 1 is produced the technology of stannous 2-ethylhexoate, it is characterized in that the optimum process condition of synthetic reaction process is:

A, in synthetic reaction process, keep the carbon dioxide gas atmosphere cause, and feed an amount of rare gas element and add an amount of oxidation inhibitor.

The optimum amount mol ratio of b, 2-ethyl acid, tin protochloride and alkali is: 1: 0.4～0.7: 0.45～0.75.

C, synthesising reacting time: 5～20 minutes.

D, distillation temperature: 105～145 ℃.

E, oxidation inhibitor: adopt preferred No. 1 oxidation inhibitor.

F, stirring velocity: per minute 300～400 changes.