CN101116830A - Method for preparing cobalt and manganese composite catalyst - Google Patents
Method for preparing cobalt and manganese composite catalyst Download PDFInfo
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- CN101116830A CN101116830A CNA2006100296735A CN200610029673A CN101116830A CN 101116830 A CN101116830 A CN 101116830A CN A2006100296735 A CNA2006100296735 A CN A2006100296735A CN 200610029673 A CN200610029673 A CN 200610029673A CN 101116830 A CN101116830 A CN 101116830A
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Abstract
The present invention discloses the preparation method of a cobalt and manganese compound catalyst, which includes the procedure to mix the manganese acetate solution together with the cobalt acetate solution in a proper ratio, both of which contain free acids, to obtain the cobalt and manganese compound catalyst, wherein the preparation method is characterized in that the cobalt acetate solution is prepared through dripping hydrogen peroxide solution into a mixture with persevered temperature mixed with the metal cobalt and the acetum solution, followed by heating circumfluence for 4 to 8 hours. The method provided by the present invention does not need to prepare the crystals of either cobalt acetate or manganese acetate, thereby being capable of efficiently decreasing the production cost.
Description
Technical field
The invention belongs to chemical field, be specifically related to a kind of catalyst of producing terephthalic acid (TPA), more specifically, is the preparation method about a kind of cobalt, manganese composite catalyst.
Background technology
In the production of terephthalic acid (TPA) (PTA), cobalt acetate and manganese acetate are two kinds of topmost catalyst.According to different PTA production technologies, 10,000 tons of PTA of every production, the consumption of cobalt acetate and manganese acetate are respectively about 1.6～3.0 tons and 0.8～30 ton.
In the use of catalyst, present most of manufacturer all is crystal (normally own Acetic Acid Glacil cobalt and the manganese acetate that obtains cobalt acetate and manganese acetate earlier, or directly buy the crystal of cobalt acetate and manganese acetate), then two kinds of crystal are added water and acetate dissolution with the preparation composite catalyst, promptly the crystal by cobalt acetate and manganese acetate prepares catalyst and is used to produce PTA.In recent years, for convenience of PTA manufacturer, the manufacturer of PTA catalyst resales after also attempting earlier catalyst dissolution being prepared into composite catalyst.
But, all can't avoid producing the general expenses that crystalline solid brought and the required cost of preparation composite catalyst of cobalt acetate, manganese acetate no matter adopt any mode.Therefore, need a kind of new technology in the industry, with the too high difficult problem of effective solution PTA production cost.
Summary of the invention
The cobalt that provides a kind of PTA of being used for to produce, the preparation method of manganese composite catalyst just are provided purpose of the present invention, and this method need not to prepare the crystalline solid of cobalt acetate, manganese acetate, thereby can effectively reduce production costs.
The preparation method of cobalt of the present invention, manganese composite catalyst comprises that the manganese acetate solution that will contain free acid mixes by proper proportion with the cobalt acetate solution that contains free acid, thereby obtain cobalt, manganese composite catalyst, it is characterized in that, the acquisition of described cobalt acetate solution is by metallic cobalt and acetic acid are dripped hydrogenperoxide steam generator under keeping warm mode, after treating that hydrogen peroxide adds, add hot reflux 4～8 hours again and obtain.
By the cobalt of method acquisition of the present invention, the production that manganese composite catalyst can be directly used in PTA, not only saved the operation for preparing manganese acetate, cobalt acetate crystalline solid, greatly reduce the production cost of PTA, and can be according to different production demands, the composite catalyst of preparation variable concentrations, thus applicability strengthened.In addition, cobalt of the present invention, manganese composite catalyst have also that method is simple, raw material is easy to get, advantages such as purity height and stable storage.
The specific embodiment
Below in conjunction with specific embodiment, the preparation method of cobalt of the present invention, manganese composite catalyst is described in further detail.Should be understood that following examples only are used to the present invention is described but not are used to limit scope of the present invention.
Employed percentage composition (%) in following examples except that specifying, is weight percentage.
Usually, different manufacturers are according to its actual needs, and are different for the content requirement of free acid in cobalt, the manganese composite catalyst, and for example free acid content is 30%, 40% etc.Following examples are that example prepares cobalt, manganese composite catalyst with free acid content 30%.
Embodiment 1, manganese acetate solution preparation
With the reaction of the glacial acetic acid solution of manganese metal and 10～30%, be reacted to nature at normal temperatures and stop, it is excessive slightly that heating keeps manganese metal then, is to stop reaction at 5～7 o'clock to reactant liquor pH, do not contained the manganese acetate solution of free acid after filtration, and concrete reaction equation is as follows:
Mn+2CH
3COOH+H
2O——Mn(CH
3COO)
2+2H
2O+H
2
Manganese acetate solution concentration to the manganese content that obtains is about 5.7%, get glacial acetic acid (100%) then, with the weight ratio of manganese acetate and glacial acetic acid is that 7: 3 ratio (being 7 parts of manganese acetate solution, 3 parts in glacial acetic acid) mixes, obtain manganese content and be about 4.0%, free acid content is 30% manganese acetate solution for standby.
According to different production requirements,, then only need mixed weight with manganese acetate and glacial acetic acid to change 6: 4 into and get final product than by 7: 3 if the requirement of free acid content is 40%; Different requirements for manganese content are generally 2.0～15.0%, also only need the manganese acetate solution concentration can be realized to different concentration.
Embodiment 2, cobalt acetate solution preparation
In reactor (this reactor is provided with reflux simultaneously), mix with 45% acetum 500g with metallic cobalt, the hydrogenperoxide steam generator 70g of dropping 30% under insulation (20～60 ℃) state, after treating that hydrogen peroxide adds, reactant liquor was added hot reflux 4～8 hours, guarantee the utilization rate of hydrogen peroxide, obtain free acid content and be about 30% cobalt content 6.0% acetum, concrete reaction equation is as follows:
Co+2CH
3COOH+H
2O
2——Co(CH
3COO)
2·4H
2O+2H
2O
According to different production requirements, if the requirement of free acid content is 40%, then only need to adjust the concentration and the consumption of acetum, just can make the cobalt acetate solution of acquisition reach required requirement by simple calculating.Requirement (being generally 2.0～15.0%) for cobalt content can make to use the same method.
Embodiment 3, cobalt, manganese composite catalyst preparation
The free acid content that get free acid content that embodiment 1 obtains and be 30%, manganese content is 4% manganese acetate solution and embodiment 2 obtains is 30%, cobalt content is 6.0% cobalt acetate solution, ratio by weight 1: 1 mixes, and promptly obtains cobalt, manganese composite catalyst.The free acid content of this composite catalyst is 30%, and the content of cobalt and manganese is respectively 3.0% and 2%.
Embodiment 4, cobalt, manganese composite catalyst the catalytic effect checking
Prepare manganese content respectively by the method for embodiment 1～3 and be followed successively by 2.0%, 5.0% and 15.0%, cobalt content is followed successively by 2.0%, 10.0% and 15.0%, free acid content is 30% cobalt, manganese composite catalyst (being designated as sample 1,2 and 3), be respectively applied for the production of terephthalic acid (TPA), the acid number of mensuration product and by product are to the content of carboxyl benzoic acid and p-methylbenzoic acid, with the existing composite catalyst of preparing with crystal in contrast, the result as shown in the following Table 1 simultaneously.
Table 1, cobalt, manganese composite catalyst catalytic effect
| Sample number | 1 | 2 | 3 | Contrast |
| Acid number | 675 | 675 | 675 | 675 |
| To carboxyl benzaldehyde mg/kg | 19 | 22 | 20 | 25 |
| P-methylbenzoic acid mg/kg | 80 | 105 | 100 | 140 |
By the result of table 2 as seen, utilize the cobalt manganese composite catalyst of method preparation of the present invention, its catalytic effect is fully not second to existing composite catalyst with the crystal preparation.
In sum, the production method of cobalt of the present invention, manganese composite catalyst has the following advantages:
1, the production of composite catalyst can be from solution directly be in harmonious proportion, and prepares composite catalyst after need not to prepare the crystalline solid of manganese acetate and cobalt acetate in advance again, thereby can significantly reduce production costs;
2, the production of manganese acetate solution is the scope that is reacted directly into pH5～7, has removed after filtration the foreign metal ion, thereby has guaranteed the quality of product;
3, be after the catalyst hydrogen peroxide is added dropwise to complete, to add again hot reflux in the process of preparation cobalt acetate, thereby guaranteed the utilization rate of hydrogen peroxide.
4, utilize the method for the present invention can be, have and strengthened applicability according to the composite catalyst of different requirement preparation variable concentrations;
5, method is simple, and raw material is easy to get, and meets the purity height of catalyst, and stable storage.
Claims (8)
1. the preparation method of a cobalt manganese composite catalyst, comprise that manganese acetate solution that will contain free acid and the cobalt acetate solution that contains free acid mix by proper proportion, to obtain cobalt, manganese composite catalyst, it is characterized in that, described cobalt acetate solution is by metallic cobalt and acetum are dripped hydrogenperoxide steam generator under keeping warm mode, after treating that hydrogen peroxide adds, add hot reflux 4～8 hours again and make.
2. preparation method as claimed in claim 1 is characterized in that, the manganese content in described cobalt, the manganese composite catalyst is 2.0～15.0wt%.
3. preparation method as claimed in claim 1 is characterized in that, the cobalt content in described cobalt, the manganese composite catalyst is 2.0～15.0wt%.
4. preparation method as claimed in claim 1 is characterized in that, the free acid content in described cobalt, the manganese composite catalyst is 30wt% or 40wt%.
5. preparation method as claimed in claim 1 is characterized in that, the temperature of described keeping warm mode is 20～60 ℃.
6. preparation method as claimed in claim 1 is characterized in that, the described manganese acetate solution that contains free acid is 1: 1 with the mixed proportion that contains the cobalt acetate solution of free acid.
7. preparation method as claimed in claim 1 is characterized in that, the described manganese acetate solution that contains free acid is manganese acetate solution is mixed with glacial acetic acid and to make.
8. preparation method as claimed in claim 7 is characterized in that, described manganese acetate is by manganese metal and glacial acetic acid solution reaction are made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100296735A CN101116830A (en) | 2006-08-03 | 2006-08-03 | Method for preparing cobalt and manganese composite catalyst |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100296735A CN101116830A (en) | 2006-08-03 | 2006-08-03 | Method for preparing cobalt and manganese composite catalyst |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103877989A (en) * | 2014-03-07 | 2014-06-25 | 烟台大学 | Preparation method and application of modified cobalt manganese binary metal oxide catalyst |
-
2006
- 2006-08-03 CN CNA2006100296735A patent/CN101116830A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103877989A (en) * | 2014-03-07 | 2014-06-25 | 烟台大学 | Preparation method and application of modified cobalt manganese binary metal oxide catalyst |
| CN103877989B (en) * | 2014-03-07 | 2016-04-13 | 烟台大学 | A kind of preparation method of modified cobalt manganese binary metal oxide catalyst and application thereof |
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Application publication date: 20080206 |
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