A kind of porous cellulose diacetate adsorbent and its preparation method and application
A technology of cellulose diacetate and adsorbent, which is applied in applications, chemical instruments and methods, and other chemical processes, can solve problems such as high cost, difficulty in industrialization, and cumbersome preparation process, and achieve reduced harmfulness and low material cost , The effect of simple process
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[0035] Above-mentioned preparation method specifically comprises the following steps:
[0036] The first step, the preparation step of cellulose diacetate solution.
[0037]Prepare a certain concentration of cellulose diacetate solution, stir evenly, and heat to the precipitation temperature.
[0038] Wherein, the cellulose diacetate solution with a certain concentration can be obtained from the ripening machine slurry in the production process of the cellulose diacetate sheet, or can be directly obtained from the solid cellulose diacetate. If the riper slurry is used as the source of raw materials, it is necessary to dilute the riper slurry to a certain extent with any one or a mixture of both solvents and non-solvents (as a diluent). If solid cellulose diacetate is used as the raw material source, it is necessary to dissolve the solid cellulose diacetate with a mixture of solvent and non-solvent.
[0039] Above-mentioned solvent is any one or the mixture of two in acetic a...
Embodiment 1
[0058] (1), prepare cellulose diacetate solution.
[0059] Get 636g cellulose diacetate ripening device slurry, it is placed in the glass reaction kettle that 5L has jacket heating, adds the acetic acid aqueous solution of 364g70% (being that the massfraction of acetic acid is 70%, is used as diluent) and dilutes, Stir with a cross stirring blade at a stirring speed of 2000 rpm while diluting, and mix uniformly to obtain a cellulose diacetate solution (the mass fraction of cellulose diacetate is 11.70%).
[0060] (2) Stop stirring, heat the cellulose diacetate solution obtained in step (1) to 85°C (precipitation temperature) with a hot water jacket and maintain this temperature, then stop stirring at a speed of 2000rpm (i.e. the first stirring speed) Stir intermittently, and slowly add 10% acetic acid aqueous solution (that is, the mass fraction of acetic acid is 10% and used as a precipitating agent) that has been preheated to 80° C. (preheating temperature) at a uniform spee...
Embodiment 2
[0070] Except that the concentration of sodium bicarbonate is changed into 5%, other preparation conditions are identical with example 1. The prepared porous cellulose acetate particles were sieved, with a particle size of 250-425 microns and a specific surface area of 45 m 2 / g and loaded with 2.3% (mass fraction) sodium bicarbonate. Join in the filter tip with 20mg / cig, adopt the same method of evaluating suction as Example 1, the results are shown in Table 2.
[0071] Table 2 Performance evaluation table of cigarette samples containing cellulose diacetate adsorbent
[0072]
[0073] It can be seen from Table 1 and Table 2 that under the same premise of other conditions, when the concentration of sodium bicarbonate is reduced from 10% to 5%, the adsorption efficiency of porous cellulose diacetate adsorbent to hydrocyanic acid in mainstream smoke is increased from 46.4% down to 31.4%.
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