SU793600A1

SU793600A1 - Method of degassing liquid with low vapour elasticity

Info

Publication number: SU793600A1
Application number: SU782632947A
Authority: SU
Inventors: Александр Аркадьевич Шлейфер; Анатолий Константинович Леонтьев; Владислав Григорьевич Кравченко; Марк Нафтальевич Гальперин; Инна Ивановна Моисеева; Сергей Игоревич Иванов
Original assignee: Предприятие П/Я В-8469
Priority date: 1978-06-29
Filing date: 1978-06-29
Publication date: 1981-01-07

Description

1one

Изобретение относитс к области удалени газов из жидкостей с низкой упругостью паров, например, масла, спиртов, углеводородов.This invention relates to the field of gas removal from liquids with low vapor pressure, for example, oils, alcohols, hydrocarbons.

Известен способ дегазации жидкости, осуществл емый путем замораживани при вакуумиррвании с последующим нагреванием жидкости 1.A known method of degassing a liquid is carried out by freezing during evacuation with subsequent heating of the liquid 1.

Наиболее близким по технической сущности и достигаемому результату к предлагаемому вл етс способ дегазации жидкости с низкой упругостью паров путем барботажа газа через слой жидкости.The closest in technical essence and the achieved result to the proposed is a method of degassing a liquid with low vapor pressure by bubbling gas through a layer of liquid.

При этом происходит замещение одного газа другим, т. е. происходит насыщение укидкости новым газом до величины парционального давлени в газовой иодушке 2.When this happens, one gas is replaced by another, i.e., a new gas is saturated with a new gas up to the value of the partial pressure in the gas column 2.

Недостатком указанного способа вл етс недостаточно высока степень очистки жидкости от присутствующих газов.The disadvantage of this method is that the degree of purification of the liquid from the gases present is not high enough.

С целью интенсификации процесса дегазации за счет создани газового кипени в предложенном способе через жидкость барботируют газ, идентичный растворенному , при условии ГДеIn order to intensify the degassing process by creating a gas boil in the proposed method, a gas identical to the dissolved gas is bubbled through the liquid, provided that

Ратм -атмосферное давление, Р ,ог -давление дегазации, Р,- давление насыщенных паров, причем Р-е поддерживают посто нным.Ratm is the atmospheric pressure, P, degassing pressure, P, is the vapor pressure, and P is kept constant.

Изменение концентрации газа при дегазации иредлагаемым способом описываетс эмпирической зависимостьюThe change in gas concentration during degassing and the proposed method is described by an empirical dependence

Ст-.у. Рде,./ Рбар ,,,St. Rde. / Rbar ,,,

--Т ехр -р--ТГ)(1)--T exp -p - TG) (1)

(1- л дег дег ж /(1- l money de w /

где Сг , Со - текуща и начальна концентрации газа в жидкости; X - коэффициент Генри; Рд,,. -давление дегазации; Рбар -давление барботируемого газа;where Cr, Co is the current and initial concentration of gas in the liquid; X is the Henry coefficient; Rd ,,. - degassing pressure; Rbar - the pressure of the barbed gas;

V-расход газа на барботаж; V;K - дегазируемый объем жидкости;V-gas consumption for bubbling; V; K is the degassed volume of the liquid;

т - врем дегазации. Пример 1. Провод т дегазацию 1 м керосина с начальной концентрацией растворенного азота Со 0,3 г/л до конечной концентрации С™,, 0,01 г/л.t is the degassing time. Example 1. A degassing of 1 m of kerosene is carried out with an initial concentration of dissolved nitrogen of Co 0.3 g / l to a final concentration of C ™, 0.01 g / l.

Коэффициент Генри дл системы азот - керосин X 0,14 г/латм.Henry's coefficient for the system nitrogen - kerosene X 0.14 g / latm.

Дл дегазации в качестве барботируемого газа примен ют азот с расходом V 0,1 г/с, давлением Р сэрб 2 атм. Дл обеспечени концентрации 0,01 г/л давление над жидкостью должно быть С0,01For degassing, nitrogen is used as sparging gas at a flow rate of V 0.1 g / s, pressure P serb 2 atm. To ensure a concentration of 0.01 g / l, the pressure above the liquid must be C0.01

Р .0,. - - 0,07 (атм).P .0 - - 0.07 (atm).

Claims

The time required for degassing, 0, is calculated by equation (1), and it is 7 minutes. Example 2. A degassing of 1 m of AMG-10 oil is carried out with an initial concentration of dissolved nitrogen of 0.4 g / l to a final concentration of C koi g / l. Henry's coefficient is for nitrogen system - AMG - 10 X 0.14 g / latm. For degassing, nitrogen is used as sparging gas at a flow rate of V o, I g / s, and a Roarb pressure of 20 atm. ø To ensure the residual concentration in the degassing liquid 0.02 g / l pressure above the liquid (P.r) must be C 0.02 P: ,,, - (), and atm.15 The time required for degassing is calculated by equation (1). In the proposed method, in order to increase the ratio and surface of the mass transfer to 2.0 bar, developed gas boiling under low pressure Pdeg is organized due to gas sparging. At the same time, gas bubbles, entering the low-pressure zone, increase in volume, float intensively, 25 which ensures strong mixing of the liquid in the whole volume, and the bubbles break up as they float. Thus, the removal of liquid gas dissolved by B occurs due to the withdrawal of gas into i through the additional surface of bubbles formed during gas bubbling. The use of this method in industry will allow to increase the speed of the degassing process and increase the degree of separation of gases dissolved in it from the liquid. DETAILED DESCRIPTION OF THE INVENTION Method for degassing a liquid with low vapor pressure by bubbling gas through a layer of liquid, characterized in that, in order to intensify the degassing process by creating gas boiling, gas identical to dissolved solution is bubbled through the liquid under the condition of Ratm Rdeg P GDB P atm - ATMOSfergy pressure, P-pressure degassing. P S is the vapor pressure, and Pdeg is kept constant. Sources of information taken into account in the examination 1. USSR author's certificate number 196714, cl. On 01 D 19/00, 04/04/06.

2. US patent number 3954425, cl. 55-44, publ. 16.02.76 (prototype).