CN105801373A - Application of strongly acidic cation exchange resin in improvement of bromination reaction yield of dulcitol - Google Patents
Application of strongly acidic cation exchange resin in improvement of bromination reaction yield of dulcitol Download PDFInfo
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Abstract
The invention relates to application of strongly acidic cation exchange resin in improvement of bromination reaction yield of dulcitol. The strongly acidic cation exchange resin provided by the invention can substantial increase the yield of dibromodulcitol to 50% or above in the process of preparation; and the effect of resin is obviously better than effect in the prior art.
Description
Technical field
The present invention relates to chemical drugs field, be specifically related to strongly acidic cation-exchange in the purposes promoting dulcitol bromination reaction yield.
Background technology
Mitolactol is also known as dibromo galactitol, and for the isomer of mitobronitol, structure is as follows:
Mitolactol itself has pharmacologically active, is also the precursor of a lot of compound.
Synthesis about mitolactol, it has been disclosed that following preparation method:
Preparation method disclosed in " synthesis of anticarcinogen Dibromoducitol " " Jiangxi Medical College's journal " second phase in 1984 is: synthesizing Dibromoducitol optimum temperature from melampyrin at ambient pressure be 90 DEG C (± 1 DEG C) suitable heat time heating time is 9 hours；Hydrobromic acid concentration should be not less than 69-70%, and otherwise yield is substantially reduced；Recrystallization solution boiling point can not be too high, and heat time heating time can not be oversize, otherwise all can significantly reduce productivity.Adopting the recrystallization the highest yield of mitolactol that the method obtains was 40% (in mol).
" in aqueous solution the stability instruction high pressure liquid chromatography of Dibromoducitol " " medicine abroad. synthetic drug. Biochemical Drugs. preparation fascicle " the 10th volume the 4th phase in 1989, also the preparation method that refer to mitolactol: galactitol 400mg is placed in refrigeration glass reactor and is dissolved in dense HBr1.2ml, this container airtight, heating 12 hours in 70 water-baths, poured into by mixed liquor in 3g ice, DBD is crystallization immediately, after ice all dissolves, filtering, filtering residue is dissolved in hot methanol, recrystallization." yield of the method gained mitolactol is open, and dense HBr refers to the acetum of HBr.
By current published technical method, the mitolactol crystallization purity of gained is low, yield is unstable；Corresponding refining means also have no any open report.
Dulcitol is practically insoluble in conventional vehicles.Above-mentioned report uses the glacial acetic acid solution of hydrogen bromide to carry out bromo-reaction, and gained crystal grain is only small, and color is partially deep, and not easy cleaning and filtration, yield is not high；When preparing with hydrobromic acid method, hydrobromic acid concentration requirement content, more than 69%, to skilled operator, could obtain a small amount of mitolactol, only when hydrobromic acid concentration is more than 80%, could obtain the yield of about 30%, but product colour is sepia；Meanwhile, the maximum concentration hydrobromic acid being commercially available in the market is 62%, exceedes this concentration, it is necessary to oneself preparation, complex process, is not suitable for the industrialization synthesis of more than feather weight.
Cation exchange resin, a kind of chemical substance, mainly for the manufacture of the purification of refined sugar and senior table syrup.
Strong-acid type refers to that, with sulfonic resin, acidity of dissociating in water is equivalent to sulphuric acid hydrochloric acid etc., has ion exchanging function within the scope of full pH.
The current application there are no strongly acidic cation-exchange in dulcitol bromination process.
Summary of the invention
It is an object of the invention to provide strongly acidic cation-exchange and promote the purposes of dulcitol bromination reaction yield.
Preferably, strongly acidic cation-exchange is: 732 types, 734 types, 7120Na type or Dowex50W-X8 type.
Preferably, the 0.1-20% that described strongly acidic cation-exchange makes consumption be dulcitol weight.
Preferably, described strongly acidic cation-exchange acid treatment adds in reaction solution after being 2-4 to pH.
Preferably, described strongly acidic cation-exchange using method is:
Being put into after in reaction vessel by dulcitol, together add reaction vessel by strongly acidic cation-exchange with mixing hydrobromic acid solution, heating is also constantly reacted, and making dulcitol bromination is mitolactol；
Or put in reaction vessel at dulcitol, add mixing hydrobromic acid solution reaction to after crystallization occurs, add strongly acidic cation-exchange, organic acid or hydrogen bromide organic acid soln, keep heating and be stirred continuously, continue reaction 5～15 hours, letting cool to room temperature, stand more than 3 hours, making dulcitol bromination is mitolactol；
Described mixing hydrobromic acid solution is hydrobromic acid aqueous solution and organic acid mixed liquor, or the mixed liquor of hydrobromic acid aqueous solution and hydrogen bromide organic acid soln.
Preferably, described dulcitol bromination reaction comprises the steps:
A dulcitol is put in reaction vessel by (), add mixing hydrobromic acid solution and strongly acidic cation-exchange；Described mixing hydrobromic acid solution is hydrobromic acid aqueous solution and organic acid mixed liquor, or the mixed liquor of hydrobromic acid aqueous solution and hydrogen bromide organic acid soln；
B () heats and is stirred continuously, make dulcitol dissolve, and continues heating and stirs to crystallization occur；
C () adds organic acid or hydrogen bromide organic acid soln, keep the temperature of step b) and be stirred continuously, and continues reaction 5～15 hours, lets cool to room temperature, stand more than 3 hours；
D () is filtered and is cleaned, dry, obtains mitolactol coarse crystallization.
Preferably, described dulcitol bromination reaction comprises the steps:
A dulcitol is put in reaction vessel by (), add mixing hydrobromic acid solution；Described mixing hydrobromic acid solution is hydrobromic acid aqueous solution and organic acid mixed liquor, or the mixed liquor of hydrobromic acid aqueous solution and hydrogen bromide organic acid soln；
B () heats and is stirred continuously, make dulcitol dissolve, and continues heating and stirs to crystallization occur；
C () adds strongly acidic cation-exchange, organic acid or hydrogen bromide organic acid soln, keep the temperature of step b) and be stirred continuously, and continues reaction 5～15 hours, lets cool to room temperature, stand more than 3 hours；
D () is filtered and is cleaned, dry, obtains mitolactol coarse crystallization.
Preferably, in described step (a), dulcitol is 1:5-30 with the mass ratio mixing hydrobromic acid solution.
Preferably, in described step (a), the concentration of hydrobromic acid aqueous solution is 40-80%.
Preferably, the mixed liquor of hydrobromic acid aqueous solution and organic acid or hydrogen bromide organic acid soln in described step (a), mass ratio is 1:0.01～2.
Preferably, described organic acid is formic acid, acetic acid, propanoic acid or butanoic acid；Described hydrogen bromide organic acid soln is containing the formic acid solution that bromination hydrogen concentration is 0.01%～60%, acetic acid solution, propionic acid solution or butanoic acid solution.
It is reversible reaction owing to dulcitol generates the reaction of mitolactol, when reaction just starts, owing in reaction mass, bromine content is high, overresponse, easily generate terbromide, tetrabormated compound, many bromines substituent and other product；Along with the carrying out of reaction, material concentration reduces, and the generation of mitolactol is increasingly difficult to, and because adding bromine deficiency during substitution reaction, can generate monobromo compound；Factors above is the main cause causing mitolactol yield too low.
For making technique simplify, and obtaining the mitolactol of high yield, the present inventor finds a kind of simple, safe solution, by adding strongly acidic cation-exchange in course of reaction, makes the yield of mitolactol be greatly improved.By resin absorption on surface after the heated dissolving of dulcitol, in being stirred continuously process, bromide ion exchanges with cation generation ion, enter the active center of resin, now, the dulcitol being adsorbed on resin surface reacts with the bromide ion entering resin activity center, thus generating mitolactol.Carrier function is played in cation exchange in course of reaction, improves the selectivity that mitolactol generates, therefore improve yield after adding resin cation exchange.Use different bromating agent, variable concentrations, different temperatures reaction condition under, add resin reaction gained mitolactol compared with not adding resin gained mitolactol, yield improves more than 50%.
Strongly acidic cation-exchange provided by the invention promotes the purposes of dulcitol bromination reaction yield and has the advantage that
1, use different bromating agent, variable concentrations, different temperatures reaction condition under, add strongly acidic cation-exchange resin reaction gained mitolactol compared with not adding resin gained mitolactol, yield improves more than 50%.
2, strongly acidic cation-exchange is readily available, and reduces to obtain high yield, uses hazardous agents to the injury of operator ' s health and to reduce environmental pollution.
Detailed description of the invention
Further illustrate the present invention by the examples below.It should be understood that embodiments of the invention are an illustration for the present invention rather than limitation of the present invention.The simple modifications that the present invention is carried out by the essence according to the present invention broadly falls into the scope of protection of present invention.Except as otherwise noted, the percent of the amount of alcohol in the present invention is percentage by volume, and v/v represents the volume ratio of solution.
Embodiment 1:
A 10kg dulcitol is put in reactor by (), add 1g acid treatment to the strong acid type cationic resin 732 that PH is 4, being simultaneously introduced 70% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:2 (weight ratio), addition is 8 times of dulcitol weight；
B () heating in water bath is to 65 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds the formic acid containing 60% hydrogen bromide of dulcitol weight 5 times, keep 65 DEG C and be stirred continuously, and continues reaction 5 hours, lets cool to room temperature, stand 3 hours；
D () reactant liquor adds 1 times amount water dilution, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 0.1 hour that 0.5 times of concentration of volume percent is 60%, drains, and 25 DEG C are decompressed to-0.01MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 100 times of coarse crystallization weight, recrystallization at 4 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 52%, average purity is 93%.
Embodiment 2:
A 10kg dulcitol is put in reactor by (), add 75% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:0.05 (weight ratio), and addition is 15 times of dulcitol weight；
B () heating in water bath is to 50 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds 50g acid treatment to the strong acid type cationic resin 734 that pH value is 2, be simultaneously introduced the formic acid of dulcitol weight 3 times, keep 50 DEG C and be stirred continuously, and continues reaction 18 hours, lets cool to room temperature, stand 8 hours；
D () reactant liquor adds 2 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 0.2 hour that 1 times of concentration of volume percent is 50%, drains, and 30 DEG C are decompressed to-0.02MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 70 times of coarse crystallization weight, recrystallization at 6 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 55%, average purity is 95%.
Embodiment 3:
A 10kg dulcitol is put in reactor by (), add 3000g acid treatment to the strong acid type cationic resin 7120Na that PH is 3, being simultaneously introduced 40% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:0.01 (weight ratio), addition is 10 times of dulcitol weight；
B () heating in water bath is to 70 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds the acetic acid of dulcitol weight 1 times, keep 70 DEG C and be stirred continuously, and continues reaction 7 hours, lets cool to room temperature, stand 9 hours；
D () reactant liquor adds 3 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 0.5 hour that 5 times of concentration of volume percent are 65%, drains, and 50 DEG C are decompressed to-0.05MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 80 times of coarse crystallization weight, recrystallization at 2 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 51%, average purity is 94%.
Embodiment 4:
A 10kg dulcitol is put in reactor by (), add 80% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:1.2 (weight ratio), and addition is 5 times of dulcitol weight；
B () heating in water bath is to 40 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds 1000g acid treatment to the strong acid type cationic resin Dowex50W-X8 that pH value is 2.5, it is simultaneously introduced dulcitol weight 0.01 again containing the acetic acid of 33% hydrogen bromide, keeps 40 DEG C and be stirred continuously, continue reaction 20 hours, let cool to room temperature, stand 10 hours；
D () reactant liquor adds 2 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 1 hour that 100 times of concentration of volume percent are 70%, drains, and 65 DEG C are decompressed to-0.1MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 150 times of coarse crystallization weight, recrystallization at 5 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 56%, average purity is 90%.
Embodiment 5:
A 10kg dulcitol is put in reactor by (), add 2000g acid treatment to the strong acid type cationic resin 734 that PH is 3.5, being simultaneously introduced 45% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:1 (weight ratio), addition is 30 times of dulcitol weight；
B () heating in water bath is to 30 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds the propanoic acid containing 0.01% hydrogen bromide of dulcitol weight 0.1 times, keep 30 DEG C and be stirred continuously, and continues reaction 15 hours, lets cool to room temperature, stand 12 hours；
D () reactant liquor adds 1 times amount water dilution, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 2 hours that 50 times of concentration of volume percent are 55%, drains, and 40 DEG C are decompressed to-0.5MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 90 times of coarse crystallization weight, recrystallization at 3 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 52%, average purity is 90%.
Embodiment 6:
A 10kg dulcitol is put in reactor by (), add 65% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:0.5 (weight ratio), and addition is 20 times of dulcitol weight；
B () heating in water bath is to 60 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds 10g acid treatment to the strong acid type cationic resin 7120Na that pH value is 4, be simultaneously introduced the propanoic acid of dulcitol weight 0.5 times, keep 60 DEG C and be stirred continuously, and continues reaction 9 hours, lets cool to room temperature, stand 5 hours；
D () reactant liquor adds 3 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 0.5 hour that 10 times of concentration of volume percent are 60%, drains, and 50 DEG C are decompressed to-0.03MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 100 times of coarse crystallization weight, recrystallization at 4 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 54%, average purity is 92%.
Embodiment 7:
A 10kg dulcitol is put in reactor by (), add 100g acid treatment to the strong acid type cationic resin Dowex50W-X8 that PH is 2, being simultaneously introduced 55% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:0.1 (weight ratio), addition is 15 times of dulcitol weight；
B () heating in water bath is to 45 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds the butanoic acid of dulcitol weight 2 times, keep 45 DEG C and be stirred continuously, and continues reaction 10 hours, lets cool to room temperature, stand 6 hours；
D () reactant liquor adds 2 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 1 hour that 0.5 times of concentration of volume percent is 70%, drains, and 25 DEG C are decompressed to-0.1MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 90 times of coarse crystallization weight, recrystallization at 3 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 53%, average purity is 91%.
Embodiment 8:
A 10kg dulcitol is put in reactor by (), add 60% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:1.5 (weight ratio), and addition is 7 times of dulcitol weight；
B () heating in water bath is to 35 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds 500g acid treatment to the strong acid type cationic resin 732 that pH value is 3.3, be simultaneously introduced the butanoic acid containing 0.1% hydrogen bromide of dulcitol weight 1 times, keep 35 DEG C and be stirred continuously, and continues reaction 12 hours, lets cool to room temperature, stand 5 hours；
D () reactant liquor adds 5 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 0.1 hour that 100 times of concentration of volume percent are 55%, drains, and 25 DEG C are decompressed to-1MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 150 times of coarse crystallization weight, recrystallization at 5 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 55%, average purity is 93%.
Comparative example 1: with reference to the embodiment of the present invention 1, without resin, step C is without organic acid or hydrogen bromide organic acid soln
A 10kg dulcitol is put in reactor by (), add 70% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:2 (weight ratio), and addition is 8 times of dulcitol weight；
B () heating in water bath is to 65 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () keeps 65 DEG C and is stirred continuously, continue reaction 5 hours, let cool to room temperature, stand 3 hours；
D () reactant liquor adds 1 times amount water dilution, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 0.1 hour that 0.5 times of concentration of volume percent is 60%, drains, and 25 DEG C are decompressed to-0.01MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 100 times of coarse crystallization weight, recrystallization at 4 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 52%, average purity is 93%.
Experimental result: mitolactol average yield 33%, average purity is 70%.
Comparative example 2: with reference to the embodiment of the present invention 2, without resin, step C is without organic acid or hydrogen bromide organic acid soln
A 10kg dulcitol is put in reactor by (), add 75% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:0.05 (weight ratio), and addition is 15 times of dulcitol weight；
B () heating in water bath is to 50 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () keeps 50 DEG C and is stirred continuously, continue reaction 18 hours, let cool to room temperature, stand 8 hours；
D () reactant liquor adds 2 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 0.2 hour that 1 times of concentration of volume percent is 50%, drains, and 30 DEG C are decompressed to-0.02MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 70 times of coarse crystallization weight, recrystallization at 6 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 32%, average purity is 68%.
Comparative example 3: with reference to the embodiment of the present invention 3, without resin, step C is without organic acid or hydrogen bromide organic acid soln
A 10kg dulcitol is put in reactor and adds 40% hydrobromic acid aqueous solution by (): the mixed liquor of acetic acid=1:0.01 (weight ratio), addition is 10 times of dulcitol weight；
B () heating in water bath is to 70 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () keeps 70 DEG C and is stirred continuously, continue reaction 7 hours, let cool to room temperature, stand 9 hours；
D () reactant liquor adds 3 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 0.5 hour that 5 times of concentration of volume percent are 65%, drains, and 50 DEG C are decompressed to-0.05MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 80 times of coarse crystallization weight, recrystallization at 2 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 35%, average purity is 71%.
Comparative example 4: with reference to the embodiment of the present invention 4, without resin
A 10kg dulcitol is put in reactor by (), add 80% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:1.2 (weight ratio), and addition is 5 times of dulcitol weight；
B () heating in water bath is to 40 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds 1000g acid treatment to the strong acid type cationic resin Dowex50W-X8 that pH value is 2.5, it is simultaneously introduced dulcitol weight 0.01 again containing the acetic acid of 33% hydrogen bromide, keeps 40 DEG C and be stirred continuously, continue reaction 20 hours, let cool to room temperature, stand 10 hours；
D () reactant liquor adds 2 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 1 hour that 100 times of concentration of volume percent are 70%, drains, and 65 DEG C are decompressed to-0.1MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 150 times of coarse crystallization weight, recrystallization at 5 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 38%, average purity is 72%.
Comparative example 5: with reference to the embodiment of the present invention 6, step c organic acid or hydrogen bromide organic acid soln are added in step a
A 10kg dulcitol is put in reactor by (), add 65% hydrobromic acid aqueous solution: the mixed liquor of acetic acid=1:0.5 (weight ratio), and addition is 20 times of dulcitol weight, is simultaneously introduced the propanoic acid of dulcitol weight 0.5 times；
B () heating in water bath is to 60 DEG C and be stirred continuously, and makes dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds 10g acid treatment to the strong acid type cationic resin 7120Na that pH value is 4, keep 60 DEG C and be stirred continuously, and continues reaction 9 hours, lets cool to room temperature, stand 5 hours；
D () reactant liquor adds 3 times amount water dilutions, filter, and filter cake is washed with water to neutrality, drains, and adds the soak with ethanol 0.5 hour that 10 times of concentration of volume percent are 60%, drains, and 50 DEG C are decompressed to-0.03MPa and dry, obtain mitolactol coarse crystallization；Mitolactol coarse crystallization adds the methanol of 100 times of coarse crystallization weight, recrystallization at 4 DEG C, obtains mitolactol.
Experimental result: mitolactol average yield 47%, average purity is 85%.
Process ration is tested:
Experimental technique: according to reaction pressure disclosed by the invention, reaction temperature and hydrobromic acid solution concentration, prepares embodiment 1-8 sample；Want, on the preparation method basis of embodiment 1-3, to deduct the reaction condition of pressurization, prepare comparative example 1-3 sample respectively；Adopt the not response parameter in reaction temperature disclosed by the invention and hydrobromic acid concentration range, prepare comparative example 4,5.Result is in Table 1.
Yield computational methods:
Method for detecting purity: method for detecting purity: according to high effective liquid chromatography for measuring, by external standard method with calculated by peak area, to obtain final product.Reference substance is laboratory self-control, and purity is 98.57%.
Table 1: dulcitol bromination reaction experimental result
Table 1 result shows:
1, the operating procedure of comparative example 1,2,3 corresponding embodiment 1,2,3 respectively, deducts resin, and step C is without organic acid or hydrogen bromide organic acid soln condition, and the yield of its mitolactol has pole significant difference (P < 0.01) with purity compared with embodiment.
2, all comparative example groups are respectively compared with embodiment group, and yield and purity all have pole significance (P < 0.01).
Test result indicate that: by response parameter provided by the invention, it is possible to obtain being substantially better than prior art and prepare the effect of gained mitolactol.
Although, above use generality explanation, detailed description of the invention and test, the present invention is described in detail, but on basis of the present invention, it is possible to it is made some modifications or improvements, and this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to the scope of protection of present invention.
Claims (11)
1. strongly acidic cation-exchange promotes the purposes of dulcitol bromination reaction yield.
2. purposes as claimed in claim 1, it is characterised in that strongly acidic cation-exchange is: 732 types, 734 types, 7120Na type or Dowex50W-X8 type.
3. purposes as claimed in claim 1 or 2, it is characterised in that: the 0.01-30% that described strongly acidic cation-exchange makes consumption be dulcitol weight.
4. purposes as claimed in claim 1 or 2, it is characterised in that: described strongly acidic cation-exchange acid treatment adds in reaction solution after being 2-4 to pH.
5. purposes as claimed in claim 1, it is characterised in that described strongly acidic cation-exchange using method is:
Being put into by dulcitol after in reaction vessel, together add reaction vessel by strongly acidic cation-exchange with mixing hydrobromic acid solution, heating is also constantly reacted, and making dulcitol bromination is mitolactol；
Or put in reaction vessel at dulcitol, add mixing hydrobromic acid solution reaction to after crystallization occurs, add strongly acidic cation-exchange, organic acid or hydrogen bromide organic acid soln, keep heating and be stirred continuously, continue reaction 5～15 hours, letting cool to room temperature, stand more than 3 hours, making dulcitol bromination is mitolactol；
Described mixing hydrobromic acid solution is hydrobromic acid aqueous solution and organic acid mixed liquor, or the mixed liquor of hydrobromic acid aqueous solution and hydrogen bromide organic acid soln.
6. purposes as claimed in claim 5, it is characterised in that described dulcitol bromination reaction comprises the steps:
A dulcitol is put in reaction vessel by (), add mixing hydrobromic acid solution and strongly acidic cation-exchange；Described mixing hydrobromic acid solution is hydrobromic acid aqueous solution and organic acid mixed liquor, or the mixed liquor of hydrobromic acid aqueous solution and hydrogen bromide organic acid soln；
B () heats and is stirred continuously, make dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds organic acid or hydrogen bromide organic acid soln, keep the temperature of step b) and be stirred continuously, and continues reaction 5～15 hours, lets cool to room temperature, stand more than 3 hours；
D () is filtered and is cleaned, dry, obtains mitolactol coarse crystallization.
7. purposes as claimed in claim 5, it is characterised in that described dulcitol bromination reaction comprises the steps:
A dulcitol is put in reaction vessel by (), add mixing hydrobromic acid solution；Described mixing hydrobromic acid solution is hydrobromic acid aqueous solution and organic acid mixed liquor, or the mixed liquor of hydrobromic acid aqueous solution and hydrogen bromide organic acid soln；
B () heats and is stirred continuously, make dulcitol dissolve, and then proceedes to heating and stirs until there is crystallization；
C () adds strongly acidic cation-exchange, organic acid or hydrogen bromide organic acid soln, keep the temperature of step b) and be stirred continuously, and continues reaction 5～15 hours, lets cool to room temperature, stand more than 3 hours；
D () is filtered and is cleaned, dry, obtains two bromo dulcitol coarse crystallization.
8. the purposes according to any one of claim 5-7, it is characterised in that dulcitol described in step (a) is 1:5-30 with the mass ratio mixing hydrobromic acid solution.
9. the purposes according to any one of claim 5-7, it is characterised in that the concentration of hydrobromic acid aqueous solution described in step (a) is 40-80%.
10. the purposes according to any one of claim 5-7, it is characterised in that the mixed liquor of hydrobromic acid aqueous solution described in step (a) and organic acid or hydrogen bromide organic acid soln, mass ratio is 1:0.01～2.
11. according to the purposes described in any one of claim 5-7, it is characterised in that described organic acid is formic acid, acetic acid, propanoic acid or butanoic acid；Described hydrogen bromide organic acid soln is containing the formic acid solution that bromination hydrogen concentration is 0.01%～60%, acetic acid solution, propionic acid solution or butanoic acid solution.
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| CN201410841388.8A Pending CN105801373A (en) | 2014-12-30 | 2014-12-30 | Application of strongly acidic cation exchange resin in improvement of bromination reaction yield of dulcitol |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HU195227B (en) * | 1986-02-28 | 1988-04-28 | Chinoin Gyogyszer Es Vegyeszet | New process for preparing 1,6-dibromo-dideoxy-d-mannitol and 1,6-dibromo-dideoxy-dulcitol |
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2014
- 2014-12-30 CN CN201410841388.8A patent/CN105801373A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HU195227B (en) * | 1986-02-28 | 1988-04-28 | Chinoin Gyogyszer Es Vegyeszet | New process for preparing 1,6-dibromo-dideoxy-d-mannitol and 1,6-dibromo-dideoxy-dulcitol |
Non-Patent Citations (1)
| Title |
|---|
| ALAIN BOUILLAUD等: "Synthesis of Dibromohydrins from Glycerol by Using an Ion Exchange Resin as Catalyst.", 《AUST. J. CHEM.》 * |
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