Method for preparing polytitanium coagulant and application thereof

A technology of coagulant and organic titanium, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc., can solve the unfavorable production of polytitanium coagulant dosage, long natural drying time, and corrosion of instruments To achieve stable and rapid coagulation effect, overcome hydrochloric acid corrosion, and excellent coagulation performance

Inactive Publication Date: 2020-05-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the applicant's follow-up research, it was found that there are still many problems in the preparation process of the precursor with titanium tetrachloride, which are mainly reflected in the rapid and stable preparation: 1) Titanium tetrachloride reacts violently as soon as it comes into contact with ethanol, and a large amount of White smoke (hydrogen chloride gas) and release a lot of heat
Once the released hydrogen chloride gas volatilizes into the atmosphere, it will seriously pollute the environment, and because the alcoholysis process is violent and difficult to control, it is impossible to obtain a titanium solution with stable acidity
2) The alcoholysis process in this patented technical scheme will generate high pressure, and the effective volume of the reaction vessel will be very small. In order to ensure the safety of the synthesis process, the volume of the reaction vessel must be large

Method used

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  • Method for preparing polytitanium coagulant and application thereof
  • Method for preparing polytitanium coagulant and application thereof
  • Method for preparing polytitanium coagulant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Stable preparation of polytitanium coagulant and performance evaluation of turbidity removal

[0037] (1) Preparation of polytitanium coagulant

[0038] a) Mix 0-10mL ethanol and 0.1-0.7mL acetylacetone evenly, add 4.1mL isopropyl titanate, and then stir at 300rpm for 30min to obtain liquid A; the molar ratio of organic titanium alkoxide, alcohol and acetylacetone is 1: 0~12: 0.06~0.5;

[0039] b) Mix 0-5mL ethanol, 0.1-0.8mL deionized water and 0.4-1.2mL concentrated hydrochloric acid to form B solution; the molar ratio of organic titanium alkoxide, alcohol, deionized water and acid is 1:0-6: 3~6: 0.5~1;

[0040] c) Add liquid B to liquid A at a rate of 0.5 mL / min, and then stir at a rate of 300 rpm for 60 min to obtain a mixed solution;

[0041] d) The mixed solution is placed at room temperature of 20°C and dried naturally for 3 days to constant weight to obtain the polytitanium coagulant

[0042] According to different proportions of alcohol, they are ...

Embodiment 2

[0055] Example 2 Rapid preparation of polytitanium coagulant and performance evaluation of turbidity removal

[0056] (1) Rapid preparation of polytitanium coagulant

[0057] a) Mix 10mL of ethanol and 0.1mL of acetylacetone evenly, add 4.1mL of isopropyl titanate, and then stir at 300rpm for 30min to obtain liquid A;

[0058] The molar ratio of organic titanium alkoxide, alcohol and acetylacetone is 1:12:0.06;

[0059] b) Mix 5mL ethanol, 0.9mL deionized water and 0.9mL concentrated hydrochloric acid to form B solution;

[0060] The molar ratio of organic titanium alkoxide, alcohol, deionized water and acid is 1:6:6:0.75

[0061] c) Add liquid B to liquid A at a rate of 120 mL / min, and then stir at a rate of 300 rpm for 60 min to obtain a mixed solution;

[0062] d) Use a spray dryer (Shanghai Qiaofeng Industrial Co., Ltd., model QFN-8000S) to dry the mixed solution, and use a peristaltic pump to pump the mixed solution into the atomizer to heat and dry within a few second...

Embodiment 3

[0069] Example 3 Prepare polytitanium coagulant in large batches and evaluate the treatment effect on actual water samples (1) Prepare polytitanium coagulant in large quantities

[0070] a) Mix 200mL of ethanol and 3.5mL of acetylacetone evenly, add 164mL of isopropyl titanate, and then stir at 300rpm for 30min to obtain liquid A;

[0071] The molar ratio of organic titanium alkoxide, alcohol and acetylacetone is 1:6:0.06;

[0072] b) Mix 100mL ethanol, 34mL deionized water and 34mL concentrated hydrochloric acid to form B solution;

[0073] The molar ratio of organic titanium alkoxide, alcohol, deionized water and acid is 1:3:6:0.75

[0074] c) Add liquid B to liquid A at a rate of 120mL / min, and then stir at a rate of 300rpm for 60min to obtain a mixed solution;

[0075] d) Use a spray dryer to dry the mixed solution, and use a peristaltic pump to pump the mixed solution into an atomizer to heat and dry within a few seconds to obtain the polytitanium coagulant. The rotati...

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Abstract

The invention discloses a method for preparing a polytitanium coagulant and application thereof. The method comprises the following specific steps: (1) uniformly mixing alcohol and an organic chelating agent, and adding organic titanium alkoxide; (2) mixing deionized water, acid and alcohol, adding the mixed liquid into (1), and performing stirring to obtain a mixed solution; and (3) drying the mixed solution in the step (2) to obtain the polytitanium coagulant. The preparation method of the polytitanium coagulant provided by the invention is mild and controllable in process, and the problem that the polytitanium coagulant is difficult to quickly and stably prepare is solved; besides, the polytitanium coagulant obtained by adopting the method has the excellent coagulation performance, canbe applied to removal of turbidity and heavy metals in wastewater, especially low-temperature low-turbidity water, high-salt wastewater, arsenic-containing and antimony-containing wastewater and the like, has low concentration of residual metals after coagulation and mild pH value of effluent, and is beneficial to operation of subsequent treatment units.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for rapidly and stably preparing a polytitanium coagulant and its application. Background technique [0002] Coagulation is the most important and basic process unit in water treatment, which can effectively remove turbidity and organic matter. Commonly used coagulants are mainly simple salts and polymers of iron and aluminum. However, the aluminum coagulant has problems such as small flocs, narrow applicable pH, and health risks in the effluent; while the iron coagulant is corrosive, and the effluent will contain a certain color and odor. In addition, the use of iron-aluminum coagulants will produce a large amount of sludge that is difficult to handle, and the coagulation effect is poor under special conditions such as low temperature and high salt. Therefore, in order to solve the problems existing in traditional coagulants, new alternative coagulants need to...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F101/20
CPCC02F1/5236C02F2101/20
Inventor 张淑娟甘永海厉豪杰李景彪吴兵党张丽
Owner NANJING UNIV
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