CN102998329A - Experimental instrument for measuring molecular weight by using freezing point depression method - Google Patents
Experimental instrument for measuring molecular weight by using freezing point depression method Download PDFInfo
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- CN102998329A CN102998329A CN2012104269200A CN201210426920A CN102998329A CN 102998329 A CN102998329 A CN 102998329A CN 2012104269200 A CN2012104269200 A CN 2012104269200A CN 201210426920 A CN201210426920 A CN 201210426920A CN 102998329 A CN102998329 A CN 102998329A
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- ice bath
- sleeve
- thermometer
- bath box
- bath case
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Abstract
The invention discloses an experimental instrument for measuring molecular weight by using a freezing point depression method. The experimental instrument comprises an alcohol thermometer, a heating tube, a beckmann thermometer, a sleeve, a freezing pipe, an air sleeve, an iron stand and an ice bath box, wherein a spring is arranged at the bottom of the ice bath box; a spring regulating knob is arranged at the side surface of the ice bath box; the heating tube is clung to and fixed with the outer side of the ice bath box; the sleeve and the air sleeve are arranged inside the ice bath box; an iron gauze is arranged at the inner wall of the sleeve; the freezing pipe is inserted in the sleeve; the beckmann thermometer is inserted in the freezing pipe; the external part of the freezing pipe is fixedly connected with the iron stand through a transverse connecting rod; and the iron stand is fixedly arranged at the outer side of the ice bath box, and the alcohol thermometer is inserted in the ice bath box. The experimental instrument has the advantages of being delicate in structure, easy to operate, convenient and practicable and the like.
Description
Technical fieldThe present invention relates to a kind of experimental facilities, especially a kind of experimental apparatus of measuring molecular weight.
Background technologyAt present, in the experiment that reduces cryoscopic method survey molecular weight, because little misoperation can cause that just supercooled liquid can't form, finally cause repetitive operation, not only lose time but also affect efficient.By analyzing, we draw the two large factors that supercooled liquid can't form: 1) when solution temperature was higher than approximate solidifying point, mobile test tube caused concussion easily, caused in advance crystallization.2) when melting clean solution, because the crystal of liquid level and air intersection is not easy to dissolve, there is crystal seed in the solution thereby make, caused coldly also can't forming.For this reason, we provide a kind of new-type equipment to solve the problems referred to above.
Summary of the inventionThe purpose of this invention is to provide a kind of reasonable in design, convenient and practical cryoscopic method and survey the experiment instrument of molecular weight.
The present invention includes alcohol thermometer, heating tube, Beckman thermometer, sleeve pipe, freeze pipe, casing air, iron stand and ice bath case, at ice bath case bottom mounting spring, side mounting spring adjusting knob; Be close to fixedly heating tube in the ice bath case outside, the inner mounting sleeve of ice bath case and casing air, described internal surface of sleeve pipe is provided with entanglement, assigns freeze pipe in sleeve pipe; Beckman thermometer is assigned in described freeze pipe inside, and the outside is connected and fixed by transverse link and iron stand, and iron stand is fixedly mounted on the ice bath case outside; Alcohol thermometer inserts in the ice bath case.
During use, survey in the experiment of molal weight of Nonvolatile solute at cryoscopic method, when temperature in the freeze pipe that is inserted with Beckman thermometer is down to below the approximate solidifying point 0.5 degree centigrade, if separate out without crystal, needs to take out freeze pipe and put into casing air.At this moment, just the adjustable springs adjusting knob descends the whole instrument that ice bath is housed together, until freeze pipe comes out from the frozen water territory fully.In order not make ice run into freeze pipe in this process, we separate ice and freeze pipe with fine and close entanglement, only make frozen water touch freezing tube wall.(if ice directly contacts with test tube, when moving down liquid level, may cause the test tube concussion).Reconcile the spring adjusting knob, spring is descended, allow liquid level separate with test tube.Then, a whole set of instrument is moved right, make casing air aim at freeze pipe, and then adjusting knob rises spring, allow freeze pipe enter casing air.Because in this process, freeze pipe is fixed on the iron stand, just instrument is moving, and has guaranteed that so just freeze pipe can not be subject to any vibrations and make internal liquid shift to an earlier date crystallization when shifting.In the mensuration of accurate solidifying point, often can occur being not easy to dissolve fully with the crystal at the liquid level place of contact with air, affect the formation of supercooled liquid.So we have added heating tube in the sleeve pipe upper end in instrument left side, utilize heat transfer theory, the temperature in the freeze pipe is raise from top to down gradually, thereby guaranteed that liquid-to-air connects place, boundary crystal and dissolves at first, and then guaranteed the smooth formation of supercooled liquid.
Compared with the prior art, beneficial effect of the present invention is: delicate structure, simple, convenient and practical, efficient is high, can save test period, improves operating accuracy.
Description of drawings
Fig. 1 is front elevation of the present invention.
Fig. 2 is side view of the present invention.
Drawing reference numeral: 1 is that alcohol thermometer, 2 is that heating tube, 3 is that Beckman thermometer, 4 is that sleeve pipe, 5 is that freeze pipe, 6 is that casing air, 7 is that iron stand, 8 is that ice bath case, 9 is that spring, 10 is the spring adjusting knob.
EmbodimentIn front elevation of the present invention shown in Figure 1, comprise alcohol thermometer 1, heating tube 2, Beckman thermometer 3, sleeve pipe 4, freeze pipe 5, casing air 6, iron stand 7 and ice bath case 8, at ice bath case bottom mounting spring 9, side mounting spring adjusting knob 10; Be close to fixedly heating tube in the ice bath case outside, the inner mounting sleeve of ice bath case and casing air, described internal surface of sleeve pipe is provided with entanglement, assigns freeze pipe in sleeve pipe; Beckman thermometer is assigned in described freeze pipe inside, and the outside is connected and fixed by transverse link and iron stand, and iron stand is fixedly mounted on the ice bath case outside; Alcohol thermometer inserts in the ice bath case.
Claims (1)
1. a cryoscopic method is surveyed the experiment instrument of molecular weight, comprise alcohol thermometer (1), heating tube (2), Beckman thermometer (3), sleeve pipe (4), freeze pipe (5), casing air (6), iron stand (7) and ice bath case (8), it is characterized in that: at ice bath case (8) bottom mounting spring (9), side mounting spring adjusting knob (10); Be close to fixedly heating tube (2) in ice bath case (8) outside, the inner mounting sleeve of ice bath case (8) (4) and casing air (6), described sleeve pipe (4) inwall is provided with entanglement, assigns freeze pipe (5) in sleeve pipe (4); Beckman thermometer (3) is assigned in described freeze pipe (5) inside, and the outside is connected and fixed by transverse link and iron stand (7), and iron stand (7) is fixedly mounted on ice bath case (8) outside; Alcohol thermometer (1) inserts in the ice bath case (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104269200A CN102998329A (en) | 2012-10-31 | 2012-10-31 | Experimental instrument for measuring molecular weight by using freezing point depression method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104269200A CN102998329A (en) | 2012-10-31 | 2012-10-31 | Experimental instrument for measuring molecular weight by using freezing point depression method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102998329A true CN102998329A (en) | 2013-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104269200A Pending CN102998329A (en) | 2012-10-31 | 2012-10-31 | Experimental instrument for measuring molecular weight by using freezing point depression method |
Country Status (1)
| Country | Link |
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| CN (1) | CN102998329A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814099A (en) * | 2017-01-04 | 2017-06-09 | 中国工程物理研究院化工材料研究所 | Freezing point, fusing point or crystalline temperature automatization test system |
| CN108982189A (en) * | 2018-09-19 | 2018-12-11 | 遵义医学院 | A kind of low-temperature homogenate device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4304119A (en) * | 1978-09-19 | 1981-12-08 | Kabushiki Kaisha Kyoto Daiichi Kagaku | Method and device for measuring the freezing point lowering |
| CN101339148A (en) * | 2008-08-14 | 2009-01-07 | 陕西师范大学 | Coagulating point determinator and its determination method |
-
2012
- 2012-10-31 CN CN2012104269200A patent/CN102998329A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4304119A (en) * | 1978-09-19 | 1981-12-08 | Kabushiki Kaisha Kyoto Daiichi Kagaku | Method and device for measuring the freezing point lowering |
| CN101339148A (en) * | 2008-08-14 | 2009-01-07 | 陕西师范大学 | Coagulating point determinator and its determination method |
Non-Patent Citations (3)
| Title |
|---|
| 刘振等: "各因素对凝固点降低法测定摩尔质量的影响", 《绍兴文理学院学报》 * |
| 牟维君: "凝固点降低法测摩尔质量实验的改进", 《中国西部科技》 * |
| 白云山等: "凝固点降低法测定摩尔质量影响因素", 《实验室研究与探索》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814099A (en) * | 2017-01-04 | 2017-06-09 | 中国工程物理研究院化工材料研究所 | Freezing point, fusing point or crystalline temperature automatization test system |
| CN108982189A (en) * | 2018-09-19 | 2018-12-11 | 遵义医学院 | A kind of low-temperature homogenate device |
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Application publication date: 20130327 |