阅读说明：本技术 一种硝酸钠溶液的制备方法和装置 (Preparation method and device of sodium nitrate solution ) 是由 杨来文 杨基林 杨文清 杨红志 于 2019-10-24 设计创作，主要内容包括：本发明公开了一种硝酸钠溶液的制备方法,S1、选材：选取碳酸氢钠30-40份、硝酸溶液40-50份、氢氧化钠5-10份、纯净水足量；S2、配置：将碳酸氢钠粉末溶于水,形成碳酸氢钠水溶液和微量的碳酸钠溶液,然后在碳酸氢钠水溶液和微量的碳酸钠溶液中加入硝酸,本发明涉及硝酸钠溶液制备技术领域。该硝酸钠溶液的制备方法和装置,通过碳酸氢钠与硝酸溶液进行反应,然后利用氢氧化钠来去除多余的氢离子,利用PH试纸测试大致的PH值,采用中和滴定的方式进行中和反应,进行PH值微调,配合酸碱指示剂显色,可以有效的去除硝酸钠溶液中的其他离子,不仅制备的纯度高,而且碳酸氢钠的成本较低,提高了硝酸钠溶液制备的经济效益。(The invention discloses a preparation method of a sodium nitrate solution, S1, selecting materials: selecting 30-40 parts of sodium bicarbonate, 40-50 parts of nitric acid solution, 5-10 parts of sodium hydroxide and sufficient purified water; s2, configuration: the invention relates to the technical field of sodium nitrate solution preparation, and discloses a method for preparing sodium nitrate by dissolving sodium bicarbonate powder in water to form a sodium bicarbonate aqueous solution and a trace amount of sodium carbonate solution, and then adding nitric acid into the sodium bicarbonate aqueous solution and the trace amount of sodium carbonate solution. According to the preparation method and device of the sodium nitrate solution, reaction is carried out on the sodium bicarbonate and the nitric acid solution, then redundant hydrogen ions are removed by using the sodium hydroxide, the pH value is roughly tested by using the pH test paper, neutralization reaction is carried out by adopting a neutralization titration mode, pH value fine adjustment is carried out, the acid-base indicator is matched for color development, other ions in the sodium nitrate solution can be effectively removed, the purity of the sodium bicarbonate solution is high, the cost of the sodium bicarbonate is low, and the economic benefit of the sodium nitrate solution preparation is improved.)

1. A preparation method of a sodium nitrate solution is characterized by comprising the following steps: the method comprises the following steps:

s1, selecting materials: selecting 30-40 parts of sodium bicarbonate, 40-50 parts of nitric acid solution, 5-10 parts of sodium hydroxide and sufficient purified water;

s2, configuration: dissolving sodium bicarbonate powder in water to form a sodium bicarbonate aqueous solution and a trace amount of sodium carbonate solution, then adding nitric acid into the sodium bicarbonate aqueous solution and the trace amount of sodium carbonate solution, slowly stirring by a stirring rod, and after stirring the mixed solution, forming nitrate ions, hydrogen ions and sodium ions in the solution, and generating carbon dioxide to generate bubbles;

s3, neutralization: at the moment, a rubber head dropper is adopted to absorb a sodium hydroxide solution, the sodium hydroxide solution is dripped into the mixed solution in S2, water is generated after hydroxide ions and hydrogen ions in the sodium hydroxide are neutralized, and the approximate pH value is tested by a pH test paper;

s4, fine adjustment of PH value: after the neutralization reaction by S3 and testing for approximate PH on PH paper, PH fine tuning was performed:

(a) after the pH test paper tests that the approximate pH value is greater than 7, indicating that excessive hydroxyl ions are dripped into S3, adopting a rubber head dropper to absorb a nitric acid solution, slowly dripping the nitric acid solution into the mixed solution, dripping a plurality of drops of an acid-base indicator into the mixed solution, and when the acid-base indicator just develops color, just equaling the pH value to 7;

(b) when the pH value is less than 7 in the PH test paper test, the situation that the hydroxide ions dripped in the S3 are insufficient is shown, at the moment, a rubber head dropper is adopted to absorb a sodium hydroxide solution, the sodium hydroxide solution is slowly dripped into the mixed solution, meanwhile, a plurality of drops of acid-base indicators are dripped into the mixed solution, and when the color of the acid-base indicators disappears, the PH value is just equal to 7;

(c) directly dripping a plurality of drops of acid-base indicators into the mixed solution after the pH test paper tests that the approximate pH value is equal to 7, and when the acid-base indicators do not develop color, indicating that the pH value is exactly equal to 7, and then finely adjusting the pH value is not needed;

s5, filtering: and (3) filtering the sodium nitrate solution subjected to the pH fine adjustment in the step S4 by using a filtering device, and taking out part of undissolved sodium bicarbonate through a filter screen to obtain the high-purity sodium nitrate solution.

2. The method for preparing a sodium nitrate solution according to claim 1, wherein: and the stirring time in the S2 by the stirring rod is 5-10 minutes.

3. The method for preparing a sodium nitrate solution according to claim 1, wherein: and when the pH value is adjusted in the S4, litmus solution is used as the acid-base indicator.

4. The utility model provides a preparation facilities of sodium nitrate solution, includes bottom plate (1), the top fixedly connected with cartridge filter (2) of bottom plate (1), its characterized in that: the left side fixedly connected with installation cylinder (3) at bottom plate (1) top, and the internal surface swing joint of installation cylinder (3) has agitator tank (4), the inside swing joint of cartridge filter (2) has filter screen (5).

5. The apparatus for preparing sodium nitrate solution according to claim 4, wherein: the upper portion fixedly connected with ring cover (6) of cartridge filter (2) inner wall, ladder groove (7) have all been seted up to the both sides at ring cover (6) top.

6. The apparatus for preparing sodium nitrate solution according to claim 4, wherein: the equal fixedly connected with ladder piece (8) in both sides of filter screen (5) bottom, two the surface of ladder piece (8) all with the internal surface sliding connection in ladder groove (7).

7. The apparatus for preparing sodium nitrate solution according to claim 4, wherein: the both sides of ring cover (6) inside just are located one side fixedly connected with magnetism piece (9) of ladder groove (7), the equal fixedly connected with handle (10) in both sides at filter screen (5) top.

8. The apparatus for preparing sodium nitrate solution according to claim 4, wherein: the bottom fixedly connected with guide plate (11) of cartridge filter (2) inner chamber, below intercommunication on cartridge filter (2) right side has discharging pipe (12).

Technical Field

The invention relates to the technical field of preparation of sodium nitrate solutions, in particular to a method and a device for preparing a sodium nitrate solution.

Background

Sodium nitrate, melting point 306.8 deg.C, density 2.257 g/cc (at 20 deg.C), is colorless transparent or white yellowish rhombohedral crystals. It is bitter in taste, readily soluble in water and liquid ammonia, slightly soluble in glycerol and ethanol, and deliquescent, especially when containing very small amount of sodium chloride impurity, the deliquescent property of sodium nitrate is greatly increased. When dissolved in water, the solution temperature decreases and the solution is neutral. Sodium nitrate is easily decomposed into sodium nitrite and oxygen gas upon heating. Sodium nitrate can support combustion and needs to be stored in a cool and ventilated place. It has oxidability, and can cause combustion or explosion by friction or impact with organic substances. It is irritant and less toxic, but harmful to human body. The enamel industry is used as a fluxing agent, an oxidizing agent and a raw material for the preparation of enamel powder. The glass industry is used as a decolorant, defoamer, clarifier and oxidizing flux for various glasses and articles.

The existing preparation method of sodium nitrate solution mostly adopts a preparation method of natural chilies niter, and is prepared by extracting the natural chilies by water, filtering, concentrating and crystallizing.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a preparation method and a device of a sodium nitrate solution, which solve the problems that most of the existing preparation methods of the sodium nitrate solution adopt a natural Chilean niter preparation method, natural Chilean niter is not easy to obtain and has higher cost, and a filter screen is fixed in the filtering process, so that the filter screen is inconvenient to disassemble, clean and take materials.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a preparation method of a sodium nitrate solution comprises the following steps:

s1, selecting materials: selecting 30-40 parts of sodium bicarbonate, 40-50 parts of nitric acid solution, 5-10 parts of sodium hydroxide and sufficient purified water;

s2, configuration: dissolving sodium bicarbonate powder in water to form a sodium bicarbonate aqueous solution and a trace amount of sodium carbonate solution, then adding nitric acid into the sodium bicarbonate aqueous solution and the trace amount of sodium carbonate solution, slowly stirring by a stirring rod, and after stirring the mixed solution, forming nitrate ions, hydrogen ions and sodium ions in the solution, and generating carbon dioxide to generate bubbles;

s3, neutralization: at the moment, a rubber head dropper is adopted to absorb a sodium hydroxide solution, the sodium hydroxide solution is dripped into the mixed solution in S2, water is generated after hydroxide ions and hydrogen ions in the sodium hydroxide are neutralized, and the approximate pH value is tested by a pH test paper;

s4, fine adjustment of PH value: after the neutralization reaction by S3 and testing for approximate PH on PH paper, PH fine tuning was performed:

(a) when the pH value is greater than 7 in the test of the pH test paper, indicating that excessive hydroxide ions are dripped in S3, sucking the nitric acid solution by using a rubber head dropper, slowly dripping the nitric acid solution into the mixed solution, dripping a plurality of drops of acid-base indicators into the mixed solution, and when the acid-base indicators just develop color, just equaling to 7 at the moment;

(b) when the pH value is less than 7 in the pH test paper, the fact that the hydroxide ions dripped in S3 are insufficient is indicated, at the moment, a rubber head dropper is used for absorbing a sodium hydroxide solution, the sodium hydroxide solution is slowly dripped into the mixed solution, meanwhile, a plurality of drops of an acid-base indicator are dripped into the mixed solution, and when the color of the acid-base indicator disappears, the pH value is just equal to 7;

(c) when the pH value is equal to 7 after the pH test paper tests, directly dripping a few drops of an acid-base indicator into the mixed solution, when the acid-base indicator does not develop color, indicating that the pH value is exactly equal to 7, and then, finely adjusting the pH value is not needed;

s5, filtering: and (3) filtering the sodium nitrate solution subjected to the pH fine adjustment in the step S4 by using a filtering device, and taking out part of undissolved sodium bicarbonate through a filter screen to obtain the high-purity sodium nitrate solution.

Preferably, the stirring in S2 by the stirring rod is slowly performed for 5 to 10 minutes.

Preferably, when the PH is adjusted in S4, litmus solution is used as the acid-base indicator.

The invention also discloses a preparation device of the sodium nitrate solution, which comprises a bottom plate, wherein the top of the bottom plate is fixedly connected with a filter cylinder, the left side of the top of the bottom plate is fixedly connected with an installation cylinder, the inner surface of the installation cylinder is movably connected with a stirring box, and the interior of the filter cylinder is movably connected with a filter screen.

Preferably, the top fixedly connected with ring cover of cartridge filter inner wall, the ladder groove has all been seted up to the both sides at ring cover top.

Preferably, the equal fixedly connected with ladder piece in both sides of filter screen bottom, two the surface of ladder piece all with the internal surface sliding connection in ladder groove.

Preferably, the both sides of ring cover inside just are located one side fixedly connected with magnetic block in the ladder groove, the equal fixedly connected with handle in both sides at filter screen top.

Preferably, the bottom of the inner cavity of the filter cartridge is fixedly connected with a guide plate, and a discharge pipe is communicated with the lower part of the right side of the filter cartridge.

(III) advantageous effects

The invention provides a preparation method and a device of a sodium nitrate solution. Compared with the prior art, the method has the following beneficial effects:

(1) the method and the device for preparing the sodium nitrate solution are characterized in that in S1, the following materials are selected: selecting 30-40 parts of sodium bicarbonate, 40-50 parts of nitric acid solution, 5-10 parts of sodium hydroxide and sufficient purified water; s2, configuration: dissolving sodium bicarbonate powder in water to form a sodium bicarbonate aqueous solution and a trace amount of sodium carbonate solution, then adding nitric acid into the sodium bicarbonate aqueous solution and the trace amount of sodium carbonate solution, slowly stirring by a stirring rod, and after stirring the mixed solution, forming nitrate ions, hydrogen ions and sodium ions in the solution, and generating carbon dioxide to generate bubbles; s3, neutralization: at the moment, a rubber head dropper is adopted to absorb a sodium hydroxide solution, the sodium hydroxide solution is dripped into the mixed solution in S2, water is generated after hydroxide ions and hydrogen ions in the sodium hydroxide are neutralized, and the approximate pH value is tested by a pH test paper; s4, fine adjustment of PH value: after the neutralization reaction by S3 and testing for approximate PH on PH paper, PH fine tuning was performed: (a) when the pH value is greater than 7 in the test of the pH test paper, indicating that excessive hydroxide ions are dripped in S3, sucking the nitric acid solution by using a rubber head dropper, slowly dripping the nitric acid solution into the mixed solution, dripping a plurality of drops of acid-base indicators into the mixed solution, and when the acid-base indicators just develop color, just equaling to 7 at the moment; (b) when the pH value is less than 7 in the pH test paper, the fact that the hydroxide ions dripped in S3 are insufficient is indicated, at the moment, a rubber head dropper is used for absorbing a sodium hydroxide solution, the sodium hydroxide solution is slowly dripped into the mixed solution, meanwhile, a plurality of drops of an acid-base indicator are dripped into the mixed solution, and when the color of the acid-base indicator disappears, the pH value is just equal to 7; (c) after the approximate PH value of PH test paper test equals 7, several drops of acid-base indicator of dropwise add in direct to the mixed solution, when the not chromogenic reaction of acid-base indicator, explain that the PH value just equals 7, need not carry out the PH value fine setting this moment can, react with the nitric acid solution through sodium bicarbonate, then utilize sodium hydroxide to remove unnecessary hydrogen ion, utilize the approximate PH value of PH test paper test, the mode of adopting neutralization titration carries out neutralization reaction, carry out the PH value fine setting, cooperate the acid-base indicator to develop color, can effectually get rid of other ions in the sodium nitrate solution, the purity of not only preparing is high, and sodium bicarbonate's cost is lower, thereby very big reduction the input of cost, the economic benefits of sodium nitrate solution preparation has been improved.

(2) The left side of the top of the bottom plate is fixedly connected with an installation cylinder, the inner surface of the installation cylinder is movably connected with a stirring box, the inside of the filter cylinder is movably connected with a filter screen, a ring sleeve is fixedly connected above the inner wall of the filter cylinder, stepped grooves are formed in two sides of the top of the ring sleeve, stepped blocks are fixedly connected to two sides of the bottom of the filter screen, the outer surfaces of the two stepped blocks are slidably connected with the inner surfaces of the stepped grooves, magnetic blocks are fixedly connected to two sides of the inside of the ring sleeve and one side of the stepped groove, handles are fixedly connected to two sides of the top of the filter screen, a guide plate is fixedly connected to the bottom of the inner cavity of the filter cylinder, a discharge pipe is communicated below the right side of the filter cylinder, the ring sleeve, the stepped groove and the stepped blocks are arranged, the filter, through setting up the magnetism piece, can conveniently fix trapezoidal piece, the stability of reinforcing filter screen installation sets up the handle, can conveniently take out the filter screen, sets up guide plate and discharging pipe, can conveniently take out sodium nitrate solution.

Drawings

FIG. 1 is a sectional view showing the internal structure of the present invention;

fig. 2 is a top view of the outer structure of the filter cartridge of the present invention.

In the figure, 1-a bottom plate, 2-a filter cylinder, 3-a heating device, 4-a mixing box, 5-a filter screen, 6-a circular sleeve, 7-a step groove, 8-a step block, 9-a magnetic block, 10-a handle, 11-a guide plate and 12-a discharge pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the embodiment of the present invention provides three technical solutions: a method and a device for preparing a sodium nitrate solution specifically comprise the following embodiments: