PL7110B1 - The method of crystallization of difficult to crystallize organic bodies. - Google Patents
The method of crystallization of difficult to crystallize organic bodies. Download PDFInfo
- Publication number
- PL7110B1 PL7110B1 PL7110A PL711026A PL7110B1 PL 7110 B1 PL7110 B1 PL 7110B1 PL 7110 A PL7110 A PL 7110A PL 711026 A PL711026 A PL 711026A PL 7110 B1 PL7110 B1 PL 7110B1
- Authority
- PL
- Poland
- Prior art keywords
- crystallization
- difficult
- organic bodies
- crystallize
- solution
- Prior art date
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- 238000002425 crystallisation Methods 0.000 title claims description 8
- 230000008025 crystallization Effects 0.000 title claims description 8
- 238000000034 method Methods 0.000 title claims description 3
- 239000013078 crystal Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical class C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- QQZWEECEMNQSTG-UHFFFAOYSA-N Ethyl nitrite Chemical compound CCON=O QQZWEECEMNQSTG-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000004656 dimethylamines Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Description
Wiadoma jest rzecza, ze przy krystali¬ zacji cial chemicznych krysztaly rozwijaja sie pomyslnie tylko w takim wypadku, jesli wyeliminuje sie okolicznosci, utrudniajace krystalizowanie. Do takich okolicznosci nalezy miedzy innemi wysoka lepkosc roz¬ tworu, doprowadzonego do stopnia krysta¬ lizacji, natomiast nizsza lepkosc roztworu dozwala na szybszy przebieg filtracji, oraz ulatwia znacznie odsaczenie krysztalów.Wplywy wysokiej lepkosci danego roz¬ tworu mozna zmniejszyc przez zastosowa¬ nie odpowiednich rozpuszczalników, wzgled¬ nie srodków rozcienczajacych, które wykazuja niska lepkosc. Do tych rozpu¬ szczalników naleza produkty o niskim punk¬ cie wrzenia, np. pochodne metanu, etylenu, eter metylowy, eter etylowy, dwumetylo- amin, azotyn etylu i t. d., przyczem nalezy uwzglednic, ze ciala te przy temperaturze krystalizowania sa lotne i nawet mala ich ilosc zmniejsza znacznie lepkosc roztworu.Celem postepowania jest zatem utrzy¬ mac w stanie plynnym wspomniane rozpu¬ szczalniki, mimo znacznej ich zdolnosci u- latniania sie przy temperaturze krystalizo¬ wania, co osiagnac mozna przez to, ze roz- czyn, z którego maja byc oddzielone kry¬ sztaly, utrzymuje sie pod cisnieniem.Jak wiadomo, cisnienie wplywa pomysl¬ nie na tworzenie sie i rozwijanie sie kry¬ sztalów. Do trudno krystalizujacych pro¬ duktów nalezy np. parafina zawarta w ciez¬ kich olejach. Oleje te rozciencza sie przezdodanie latwo lotnej gazoliny o ciezarze ga¬ tunkowym ponizej 0,700 i rozczyn ten pod¬ daje sie krystalizacji przy temperaturze 5° C i nadcisnieniu 5 atm. Tworzace sie przytem krysztaly parafiny daje sie bez jakichkolwiek trudnosci, przez zastosowa¬ nie zwyczajnych urzadzen filtracyjnych, odsaczyc z rozczynu olejów smarowych. krystalizacji dodaje sie srodki rozciencza¬ jace, wzglednie rozpuszczalniki, które przy temperaturze tworzenia sie krysztalów i ci¬ snieniu atmosferycznem posiadaja zinaczna zdolnosc ulatniania sie, przyczem w celu utrzymania rozpuszczalników wskazanych w stanie plynnym wywierane zostaje odpo¬ wiednie cisnienie. PL PLIt is known that in the crystallization of chemical bodies, crystals only develop successfully if the conditions which impede crystallization are eliminated. Such circumstances include, among other things, the high viscosity of the solution, brought to the degree of crystallization, while the lower viscosity of the solution allows for faster filtration, and facilitates significantly drainage of the crystals. The effects of high viscosity of a given solution can be reduced by the use of appropriate solvents relative to diluting agents which exhibit a low viscosity. These solvents include products with a low boiling point, e.g. methane, ethylene derivatives, methyl ether, diethyl ether, dimethylamines, ethyl nitrite, and so on, it must be taken into account that these bodies are volatile at the crystallization temperature and even a small amount of them significantly reduces the viscosity of the solution. The aim of the procedure is therefore to keep the said solvents in a liquid state, despite their considerable volatility at the crystallization temperature, which can be achieved by the fact that the solution from which They are to be separated from the crystals, they are kept under pressure. As is well known, pressure has a positive effect on the formation and development of crystals. Difficult to crystallize products are, for example, paraffin contained in heavy oils. These oils are diluted by the addition of a readily volatile gasoline with a specific gravity of less than 0.700, and this solution is crystallized at a temperature of 5 ° C. and an excess pressure of 5 atm. The paraffin crystals formed in this way can be drained of the lubricating oil solution without any difficulties, by using ordinary filtration devices. In the case of crystallization, diluting agents or solvents are added which, at the temperature of crystal formation and atmospheric pressure, have a slight volatility, and a suitable pressure is exerted in order to keep the solvents indicated in a liquid state. PL PL
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL7110B1 true PL7110B1 (en) | 1927-04-30 |
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