CN210825456U - A purification device for potassium nitrate processing - Google Patents
A purification device for potassium nitrate processing Download PDFInfo
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- CN210825456U CN210825456U CN201921585590.3U CN201921585590U CN210825456U CN 210825456 U CN210825456 U CN 210825456U CN 201921585590 U CN201921585590 U CN 201921585590U CN 210825456 U CN210825456 U CN 210825456U
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- Prior art keywords
- potassium nitrate
- shell
- dissolving tank
- funnel
- sets
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- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 235000010333 potassium nitrate Nutrition 0.000 title claims abstract description 49
- 239000004323 potassium nitrate Substances 0.000 title claims abstract description 49
- 238000000746 purification Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims description 22
- 238000005192 partition Methods 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 4
- 239000005457 ice water Substances 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims 6
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000009833 condensation Methods 0.000 abstract description 9
- 230000005494 condensation Effects 0.000 abstract description 9
- 239000013078 crystal Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000004090 dissolution Methods 0.000 abstract description 4
- 239000003651 drinking water Substances 0.000 abstract 2
- 235000020188 drinking water Nutrition 0.000 abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 235000016623 Fragaria vesca Nutrition 0.000 description 1
- 240000009088 Fragaria x ananassa Species 0.000 description 1
- 235000011363 Fragaria x ananassa Nutrition 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 244000061456 Solanum tuberosum Species 0.000 description 1
- 235000002595 Solanum tuberosum Nutrition 0.000 description 1
- DHKHZGZAXCWQTA-UHFFFAOYSA-N [N].[K] Chemical compound [N].[K] DHKHZGZAXCWQTA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
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Abstract
The utility model discloses a purification device for potassium nitrate processing, which comprises a housin, the casing middle part sets up the feeder hopper, the inside broken pivot that sets up of casing, set up broken blade in the broken pivot, broken pivot upper end is connected with motor output shaft end, broken pivot below sets up the funnel, the fixed cylinder that sets up of funnel lower extreme left side outer wall, cylinder piston rod tip fixed connection fly leaf, the funnel below is provided with the dissolving tank, the dissolving tank top is open structure form, and the dissolving tank left end is provided with the feed liquor pipe that stretches out to the casing, the inside level of dissolving tank is provided with first baffle, set up the electrothermal tube between first baffle and the casing bottom, dissolving tank right side wall sets up the drinking-water pipe, drinking-water pipe connection water pump, the water pump goes out the water port and sets up the drain. The utility model discloses can carry out the breakage with cubic potassium nitrate, improve potassium nitrate dissolution efficiency, can accelerate the speed that the crystal was appeared in the potassium nitrate condensation, satisfy the production demand of enterprise big batch processing.
Description
Technical Field
The utility model relates to a potassium nitrate processing production technical field specifically is a purification device for potassium nitrate processing.
Background
Potassium nitrate is a chemical fertilizer containing 13.8% of nitrogen and 46.6% of potassium oxide. Commonly known as potassium nitrate or potassium nitrate. The relative molecular mass was 101.10. Is colorless transparent orthorhombic crystal or rhombic crystal or white powder, absorbs moisture in air to be tiny and is not easy to agglomerate. The relative density is 2.019 (16 ℃), the melting point is 334 ℃, the water solubility is easy to dissolve, and the solubility is increased rapidly along with the temperature increase. Can be dissolved in liquid ammonia and glycerol, and is insoluble in anhydrous ethanol and diethyl ether. The potassium nitrate is a chlorine-free nitrogen-potassium compound fertilizer, has high solubility, and the effective components of nitrogen and potassium can be quickly absorbed by crops, so that no chemical substance is left. It is suitable for application to vegetables, fruits and flowers, and some chlorine-sensitive crops (such as potato, strawberry, beans, etc.). Potassium nitrate is a strong oxidant and can cause combustion and explosion when in contact with organic matter. Therefore, the potassium nitrate should be stored in a cool and dry place away from the fire and heat sources. The materials are not required to be stored and transported together with reducing agents, acids and inflammable substances.
Current potassium nitrate purification equipment is to the lower potassium nitrate of purity mode of purifying, is directly to send into the dissolving tank with massive nitric acid and heats and dissolve, makes the time of dissolving long, and the inefficiency of dissolving needs to wait for a long time that the potassium nitrate temperature fell moreover when carrying out the condensation to appear the potassium nitrate crystallization, waste a large amount of time, efficiency is not high when big batch processing production, and degree of automation is lower, is unfavorable for the processing production of enterprise's mass and scale.
SUMMERY OF THE UTILITY MODEL
The utility model aims at above problem, provide a purification device for potassium nitrate processing, it can carry out the breakage with cubic potassium nitrate, and the efficiency that the great improvement potassium nitrate was dissolved can accelerate the potassium nitrate condensation and appear the speed of crystal, satisfies the production demand of enterprise big batch processing.
In order to realize the above purpose, the utility model adopts the technical scheme that: a purification device for potassium nitrate processing comprises a shell, wherein a feed hopper is fixedly arranged in the middle of the top end of the shell, a crushing rotating shaft is vertically arranged in the shell at intervals, a crushing blade is fixedly arranged on the crushing rotating shaft and is of a sheet structure with sharp edges, the upper end of the crushing rotating shaft penetrates through the top of the shell and is connected with the output shaft end of a motor in a protective cover, the motor is fixed on the inner wall of the top of the protective cover through a connecting bolt, a funnel is arranged below the crushing rotating shaft, the upper end of the funnel is inclined and is fixed with the inner wall of the shell, the lower end of the funnel is of a square opening structure, a cylinder is fixedly arranged on the outer wall of the left side of the lower end of the funnel, the end of a piston rod of the cylinder is fixedly connected with a movable plate, a dissolving tank is arranged below the funnel, the, an electric heating pipe is arranged between the first partition plate and the bottom of the shell, a water pumping pipe is arranged on the right side wall of the dissolving tank and above the first partition plate, one end of the water pumping pipe is connected with a water pump through a pipeline, and a water outlet port of the water pump is provided with a water drainage pipe which extends to the inside of the cooling tank.
Further, a bearing is arranged between the crushing rotating shaft and the top of the shell.
Further, the movable plate is of an L-shaped plate structure, the lower end of the movable plate horizontally penetrates through the lower end outlet of the funnel, and when a piston rod of the air cylinder stretches out and draws back, the movable plate is connected with the lower end outlet of the funnel in an on-off mode.
Furthermore, a control valve, a flow sensor and a temperature sensor are arranged on the liquid inlet pipe.
Furthermore, a filter screen is arranged inside the upper end of the cooling tank.
Furthermore, a second partition plate is arranged inside the lower end of the cooling tank, a drawer is arranged between the second partition plate and the bottom of the cooling tank, and ice blocks or ice-water mixtures are arranged in a cavity on the left side of the drawer.
Furthermore, the outer side wall of the right end of the cooling groove is hinged with a second movable door.
Further, the outer side wall of the right end of the shell is hinged with a first movable door.
Furthermore, four rollers are arranged at the bottom of the shell.
The utility model has the advantages that: the utility model provides a purification device for potassium nitrate processing, it can carry out breakage with cubic potassium nitrate, and the efficiency that the great improvement potassium nitrate was dissolved can accelerate the speed that the crystal was appeared in the potassium nitrate condensation, satisfies the production demand of enterprise big batch processing.
1. The utility model discloses be provided with broken pivot and crushing blade, can become broken in small, broken bits or powdered with cubic potassium nitrate, improve the dissolution efficiency of potassium nitrate in the dissolving tank, shorten the time of production and processing.
2. The utility model discloses be provided with cylinder and fly leaf, realize controlling the break-make of fly leaf to the export of funnel lower extreme through cylinder piston rod's flexible.
3. The utility model discloses be provided with the control flap who is used for controlling the break-make on the feed liquor pipe for detect the flow sensor of flow and be used for detecting the temperature sensor of temperature.
4. The utility model discloses be provided with the water pump, can take out the potassium nitrate solution after the thermosol from the thermosol inslot, carry the cooling bath in and carry out the condensation operation.
5. The utility model discloses be provided with the filter screen in the cooling tank, can filter the impurity in the hot dissolution potassium nitrate solution, improve the purity that the crystal was appeared in the potassium nitrate condensation, the quality of very big improvement product.
6. The utility model discloses be provided with the drawer in the cooling bath, can hold ice-cube or frozen water mixture in the drawer, temperature when can effectively reduce the cooling bath in the condensation improves the cooling rate that hot solution carries out the heat exchange, and the design of drawer type is opened and is taken all ten minutes conveniently, and the ice-cube or frozen water mixture reuse that the condensation was used can not waste the water resource.
Drawings
Fig. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural view of a cooling tank of the present invention.
The text labels in the figures are represented as: 1. a housing; 101. a feed hopper; 102. a funnel; 103. a first movable door; 2. a bearing; 3. a motor; 301. crushing the rotating shaft; 302. crushing the blade; 4. a protective cover; 5. a cylinder; 6. a movable plate; 7. a liquid inlet pipe; 8. a control valve; 9. a flow sensor; 10. a temperature sensor; 11. a dissolving tank; 1101. a first separator; 1102. an electric heating tube; 12. a water pump; 1201. a water pumping pipe; 1202. a drain pipe; 13. a roller; 14. a cooling tank; 1401. a filter screen; 1402. a second movable door; 1403. a second separator; 1404. a drawer.
Detailed Description
In order to make the technical solution of the present invention better understood, the present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention.
As shown in fig. 1-2, the specific structure of the present invention is: a purification device for potassium nitrate processing comprises a shell 1, a feed hopper 101 is fixedly arranged in the middle of the top end of the shell 1, a crushing rotating shaft 301 is vertically arranged in the shell 1 at intervals, a crushing blade 302 is fixedly arranged on the crushing rotating shaft 301 and is of a sheet structure with sharp edges, the upper end of the crushing rotating shaft 301 penetrates through the top of the shell 1 to be connected with the output shaft end of a motor 3 in a protective cover 4, the motor 3 is fixed on the inner wall of the top of the protective cover 4 through a connecting bolt, the motor 3 drives the crushing rotating shaft 301 and the crushing blade 302 to do rotary motion, massive potassium nitrate fed from the feed hopper 101 is sufficiently crushed, a hopper 102 is arranged below the crushing rotating shaft 301, the hopper 102 is used for collecting and guiding and conveying the crushed potassium nitrate, the upper end of the hopper 102 is inclined and is fixed with the inner wall of the shell 1, and the lower end of the hopper 102 is, and the outer wall of the left side of the lower end of the funnel 102 is fixedly provided with a cylinder 5, the end part of a piston rod of the cylinder 5 is fixedly connected with a movable plate 6, a dissolving tank 11 is arranged below the funnel 102, the top of the dissolving tank 11 is in an open structure shape, the left end of the dissolving tank 11 is provided with a liquid inlet pipe 7 extending out of the shell 1, a first partition 1101 is horizontally arranged inside the dissolving tank 11, an electric heating pipe 1102 is arranged between the first partition 1101 and the bottom of the shell 1, the right side wall of the dissolving tank 11 is provided with a water pumping pipe 1201 above the first partition 1101, one end of the water pumping pipe 1201 is connected with a water pump 12 through a pipeline, and a water outlet port of.
Referring to fig. 1, in order to facilitate the rotation stability of the crushing rotating shaft 301 and the crushing blades 302 and to better crush potassium nitrate, a bearing 2 is disposed between the crushing rotating shaft 301 and the top of the housing 1.
Referring to fig. 1, in order to facilitate the on-off control of the lower outlet of the funnel 102, the movable plate 6 is in an L-shaped plate structure, and the lower end of the movable plate horizontally penetrates through the lower outlet of the funnel 102, and when the piston rod of the cylinder 5 extends and contracts, the movable plate 6 is on or off the lower outlet of the funnel 102.
Referring to fig. 1, in order to facilitate the addition of the solution into the dissolution tank 11, and the on-off control, flow rate detection, and temperature detection of the solution, a control valve 8, a flow rate sensor 9, and a temperature sensor 10 are disposed on the liquid inlet pipe 7.
Referring to fig. 1 and 2, a filter screen 1401 is provided inside the upper end of the cooling tank 14 to facilitate the filtering of impurities in the potassium nitrate solution.
Referring to fig. 1 and 2, in order to facilitate the rapid precipitation of potassium nitrate crystals, a second partition 1403 is arranged inside the lower end of the cooling tank 14, a drawer 1404 is arranged between the second partition 1403 and the bottom of the cooling tank 14, and ice cubes or an ice-water mixture is arranged in a cavity on the left side of the drawer 1404.
Referring to fig. 1 and 2, in order to facilitate the taking out of the potassium nitrate crystal from the cooling tank 14, a second movable door 1402 is hinged on the outer side wall of the right end of the cooling tank 14.
Referring to fig. 1, in order to facilitate the removal of potassium nitrate crystals precipitated in the cooling tank 14 and the placement of ice cubes or ice-water mixture for condensation in the drawer 1404, a first movable door 103 is hinged to the outer side wall of the right end of the housing 1.
Referring to fig. 1, in order to facilitate the transportation and movement of the whole device, four rollers 13 are disposed at the bottom of the housing 1.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention have been explained herein using specific examples, which are presented only to assist in understanding the methods and their core concepts. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the above technical features can be combined in a proper manner; the application of these modifications, variations or combinations, or the application of the concepts and solutions of the present invention in other contexts without modification, is not intended to be considered as a limitation of the present invention.
Claims (9)
1. The purification device for potassium nitrate processing is characterized by comprising a shell (1), a feed hopper (101) is fixedly arranged in the middle of the top end of the shell (1), crushing rotating shafts (301) are vertically arranged in the shell (1) at intervals, crushing blades (302) are fixedly arranged on the crushing rotating shafts (301), the crushing blades (302) are of a sheet-like structure with sharp edges, the top of each crushing rotating shaft (301) penetrating through the shell (1) is connected with the output shaft end of a motor (3) in a protective cover (4), the motor (3) is fixed on the inner wall of the top of the protective cover (4) through a connecting bolt, a funnel (102) is arranged below the crushing rotating shafts (301), the upper end of the funnel (102) is inclined and fixed with the inner wall of the shell (1), the lower end of the funnel (102) is of a square opening structure, and a cylinder (5) is fixedly arranged on the outer wall of the, the end part of a piston rod of the cylinder (5) is fixedly connected with a movable plate (6), a dissolving tank (11) is arranged below the funnel (102), the top of the dissolving tank (11) is in an open structure shape, a liquid inlet pipe (7) extending out of the shell (1) is arranged at the left end of the dissolving tank (11), a first partition plate (1101) is horizontally arranged inside the dissolving tank (11), an electric heating pipe (1102) is arranged between the first partition plate (1101) and the bottom of the shell (1), a water pumping pipe (1201) is arranged on the right side wall of the dissolving tank (11) and above the first partition plate (1101), one end of the water pumping pipe (1201) is connected with a water pump (12) through a pipeline, and a water outlet of the water pump (12) is provided with a water drainage pipe (1202.
2. A refining apparatus for potassium nitrate process according to claim 1, characterized in that a bearing (2) is provided between the crushing rotating shaft (301) and the top of the shell (1).
3. The potassium nitrate refining device according to claim 1, wherein the movable plate (6) is of an L-shaped plate structure, the lower end of the movable plate horizontally penetrates through the lower outlet of the hopper (102), and when a piston rod of the cylinder (5) extends and retracts, the movable plate (6) is opened and closed to the lower outlet of the hopper (102).
4. The purification device for potassium nitrate processing according to claim 1, characterized in that the liquid inlet pipe (7) is provided with a control valve (8), a flow sensor (9) and a temperature sensor (10).
5. The refining apparatus for potassium nitrate processing according to claim 1, characterized in that a filter screen (1401) is arranged inside the upper end of the cooling tank (14).
6. The refining device for potassium nitrate processing according to claim 1, characterized in that a second partition plate (1403) is arranged inside the lower end of the cooling tank (14), a drawer (1404) is arranged between the second partition plate (1403) and the bottom of the cooling tank (14), and ice cubes or an ice-water mixture are arranged in a cavity on the left side of the drawer (1404).
7. The potassium nitrate refining device of claim 1, wherein a second movable door (1402) is hinged on the outer side wall of the right end of the cooling tank (14).
8. The purifying device for potassium nitrate processing according to claim 1, characterized in that the outer side wall of the right end of the shell (1) is provided with a first movable door (103) in a hinged manner.
9. A potassium nitrate refining apparatus according to claim 1, wherein the bottom of the shell (1) is provided with four rollers (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921585590.3U CN210825456U (en) | 2019-09-23 | 2019-09-23 | A purification device for potassium nitrate processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921585590.3U CN210825456U (en) | 2019-09-23 | 2019-09-23 | A purification device for potassium nitrate processing |
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| Publication Number | Publication Date |
|---|---|
| CN210825456U true CN210825456U (en) | 2020-06-23 |
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ID=71259706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921585590.3U Active CN210825456U (en) | 2019-09-23 | 2019-09-23 | A purification device for potassium nitrate processing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210825456U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111807387A (en) * | 2020-07-31 | 2020-10-23 | 山东财富化工有限公司 | Potassium nitrate purification device |
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2019
- 2019-09-23 CN CN201921585590.3U patent/CN210825456U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111807387A (en) * | 2020-07-31 | 2020-10-23 | 山东财富化工有限公司 | Potassium nitrate purification device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: LIUYANG JINHE CHEMICALS Co.,Ltd. Assignor: HUNAN MEIAO POTASSIUM INDUSTRY CO.,LTD. Contract record no.: X2023980044001 Denomination of utility model: A Purification Device for Potassium Nitrate Processing Granted publication date: 20200623 License type: Common License Record date: 20231023 |
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| EE01 | Entry into force of recordation of patent licensing contract |