US2774441A - Process and apparatus for the degassing of viscose - Google Patents

Process and apparatus for the degassing of viscose Download PDF

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Publication number
US2774441A
US2774441A US395161A US39516153A US2774441A US 2774441 A US2774441 A US 2774441A US 395161 A US395161 A US 395161A US 39516153 A US39516153 A US 39516153A US 2774441 A US2774441 A US 2774441A
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United States
Prior art keywords
viscose
pipe
solution
conduit
column
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US395161A
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English (en)
Inventor
Buurman Aart
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Akzona Inc
Original Assignee
American Enka Corp
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Publication date
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Publication of US2774441A publication Critical patent/US2774441A/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D1/00—Treatment of filament-forming or like material
    • D01D1/10—Filtering or de-aerating the spinning solution or melt
    • D01D1/103—De-aerating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0042—Degasification of liquids modifying the liquid flow
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S159/00—Concentrating evaporators
    • Y10S159/04—Foam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S159/00—Concentrating evaporators
    • Y10S159/31—Deaeration

Definitions

  • This invention relates to a method and apparatus for the continuous deaeration of viscose spinning solutions such as are employed in the manufacture of rayon yarns, films, foils and the like.
  • the spinning solution be deaer-ated before delivery to the spinning pumps.
  • this deaeration has been brought about by delivering the spinning solution to an evacuated tank where the gas in the solution is evolved as a result of the reduced pressure. While this method is efiective to eliminate gas, the amount of foam produced is so great that the capacity of the system is quite low in relation to its size so that to handle a large quantity of viscose a tank of tremendous capacity is necessary.
  • the spinning solution to be treated be passed from the bottom up through a pipe having a substantial, vertical component and that the atmosphere at the top of the pipe be held under strongly reduced pressure.
  • the viscose is flowed upwardly through the pipe at a speed such that the temperature and pressure conditions permit boiling at the bottom of the pipe while, as a result, of cooling, the solution no longer is boiling at the top of the pipe.
  • the solution and the gases are separately recovered.
  • Figure l is a schematic view partially in elevation and partially in section of a viscose deaeration system according to the present invention.
  • Figure 2 is a view similar to Figure 1 of a modified deaeration arrangement according to the present invention.
  • the numeral 10 represents a viscose storage tank which is connected by a pipe 11 to a heat exchanger 12. After passage through the heat exchanger 12, the viscose is delivered from the heat exchanger through a valve 13 to a vertical pipe 14 which leads upwardly to a low pressure chamber 15 containing therein a weir 16, a deaerated viscose discharge line 17 and a gas withdrawal conduit 18.
  • the viscose is warmed to a temperature below its boiling point at the existing pressure, i. e., about C.
  • the supply to the pipe 14 is so regulated that below the valve 13, for example at the point 19, the pressure of the viscose is atmospheric or higher. A substantial vacuum is maintained in the container 15.
  • the pressure will gradually decrease owing to the vacuum above the liquid level. Incident to the reduction in pressure, any air bubbles in the viscose will tend to increase in size. Furice thermore, when the pressure on the liquid gets below the vapor pressure of the solution, boiling will occur, and vapor bubble formation takes place around the air bubble nucleus. The rate of How upwardly in the pipe 14 is so regulated that the temperature drop caused by boiling will have cooled the viscose enough so that when it flows to the pipe 17, boiling has stopped.
  • foam forms in the pipe 11 it is found to persist within the vertical pipe 14.
  • the movement of the liquid upwardly in pipe 14 is at such a rate that the bubbles go up with, rather than with respect to, the solution. If the bubbles formedare too large and tend to rise faster than the liquid, the deaeration pipe 14 should be baffled, as fol-example by the use of sieves of 0.3 to 0.5 centimeter mesh. 7
  • the numeral20 represents a heat exchanger which is fed with viscose from a source, not shown, by a pipe 21.
  • the warmed viscose is led through a valve 22 in a supply conduit 23 which terminates in a restricted orifice 24.
  • the pipe 23 is disposed coaxially in a vertical pipe 25 which functions as the deaeration pipe.
  • the pipe 25 terminateates in a weir at 26 and has above it a low pressure chamber 27 from which vapors may be withdrawn through a conduit 28.
  • the liquid spilling over the weir 26 flows out through a conduit 29 to use.
  • the orifice at 24 is of such size as to keep the pressure within the pipe 23 at a value which will not permit of boiling at the prevailing temperature.
  • Sieves 30 f 0.3 to 0.5 centimeter mesh act to retard the rise of vapor bubblesand to keep those bubbles from moving upwardly at a rate much faster than the spinning liquid.
  • the meshes 30 were 0.5 centimeter and the pressure in the chamber 27 was adjusted at 20 millimeters of mercury absolute. At the lower end of the pipe 29, 1920 cubic centimeters of viscose per minute was discharged and upon testing was found to contain less than 0.02% of both dispersed and dissolved air while having a xanthate ratio of 0.56. It was found that'water was evaporated at the rate of about 80 centimeters a minute and the cellulose and NaOH content of the viscose rose to about 6.75 and 8.3%, respectively.
  • Apparatus for the deaeration of viscose that comprises means defining a chamber, a substantially vertical conduit extending below saidch amber' and with .its top' in communication therewith, means subdividing theicross section of said conduit for a part of its length, means to for upward flow into said chamber, means to heatthe viscose supplied to said'conduit, means to maintain said chamber at a pressure below atmospheric and low enough to cause boiling at the existing temperature of the viscose solution before the viscose reaches the top of the conduit and means to recover liquid from said chamber at a level below the top of said conduit.
  • Apparatus for the deaeration of viscose that comprises means defining a chamber, a substantially vertical conduit extending below said chamber and at its top in communication therewith, means to evacuate the chamber, means to supply viscose solution to the bottom of said conduit for upward flow into said chamber, means to heat the viscose solution supplied to the bottom of said conduit to a temperature high enough to cause boiling in said conduit before. the solution issues from the top of the conduit of the said chamber and means to recover liquid from said chamber.
  • the method of degassing spinning solutions that comprises, passing succeeding volumes of a spinning solution upwardly through acolumn and spilling the same into a zone at the top of the column while adjusting the temperature of the viscose entering the column and the pressure in said zone tofcause boiling to occur in the column but to terminate before the solution spills into said zone and recovering the degassed solution from said zone.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Textile Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Artificial Filaments (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US395161A 1953-02-09 1953-11-30 Process and apparatus for the degassing of viscose Expired - Lifetime US2774441A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL759169X 1953-02-09

Publications (1)

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US2774441A true US2774441A (en) 1956-12-18

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US395161A Expired - Lifetime US2774441A (en) 1953-02-09 1953-11-30 Process and apparatus for the degassing of viscose

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US (1) US2774441A (en))
BE (1) BE522463A (en))
DE (1) DE1089113B (en))
GB (1) GB759169A (en))
NL (2) NL77351C (en))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1182382B (de) * 1958-12-23 1964-11-26 Standard Messo Duisburg Vorrichtung zum Entlueften und Kuehlen von Viskose unter Anwendung von Vakuum-verdampfung
US3229445A (en) * 1961-06-21 1966-01-18 Automatic Process Control Inc Method and apparatus for continuously degassing a liquid
US3793805A (en) * 1971-12-13 1974-02-26 Eastman Kodak Co Method and apparatus for removing air from a liquid
CN115522265A (zh) * 2022-05-24 2022-12-27 崔文斌 一种化纤布制造用化纤丝预处理设备
US11550342B2 (en) * 2016-09-09 2023-01-10 Endress+Hauser Flowtec Ag Gas separator and apparatus for measuring flow of one or more components of a multiphase medium, especially a natural gas-water mixture
CN116196657A (zh) * 2021-11-30 2023-06-02 内蒙古伊利实业集团股份有限公司 用于消除涂挂酱料中的气泡的装置和方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1197846B (de) * 1961-03-16 1965-08-05 Daimler Benz Ag Verfahren und Vorrichtung zum Entgasen von Fluessigkeiten oder Schmelzen
BE615380A (en)) * 1961-03-22

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US414618A (en) * 1889-11-05 Serei
US847085A (en) * 1906-06-23 1907-03-12 Fischer Ernst Apparatus for treating foaming liquids.
US863031A (en) * 1907-08-13 Fischer Ernst Apparatus for treating foaming liquids.
US1529884A (en) * 1925-03-17 Apparatus por deaeration op liquids
US1581371A (en) * 1925-02-04 1926-04-20 Edwin C Weisgerber Gas and oil separator
US1752215A (en) * 1928-04-09 1930-03-25 Smith Separator Company Oil and gas separator
US1926191A (en) * 1926-10-15 1933-09-12 Boucherot Paul Treatment of quantities of water
US2006985A (en) * 1926-03-13 1935-07-02 Claude George Method and apparatus for obtaining power from sea water
US2355057A (en) * 1941-07-18 1944-08-08 Du Pont Apparatus for deaerating viscose compositions

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE389698C (de) * 1924-02-06 Schmidt Sche Heissdampf Ges M Verfahren zum Reinigen vorgewaermten Kesselspeisewassers von gasfoermigen Beimischungen
DE734028C (de) * 1935-06-21 1943-04-07 Kraftanlagen Ag Entgasungsanlage

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US414618A (en) * 1889-11-05 Serei
US863031A (en) * 1907-08-13 Fischer Ernst Apparatus for treating foaming liquids.
US1529884A (en) * 1925-03-17 Apparatus por deaeration op liquids
US847085A (en) * 1906-06-23 1907-03-12 Fischer Ernst Apparatus for treating foaming liquids.
US1581371A (en) * 1925-02-04 1926-04-20 Edwin C Weisgerber Gas and oil separator
US2006985A (en) * 1926-03-13 1935-07-02 Claude George Method and apparatus for obtaining power from sea water
US1926191A (en) * 1926-10-15 1933-09-12 Boucherot Paul Treatment of quantities of water
US1752215A (en) * 1928-04-09 1930-03-25 Smith Separator Company Oil and gas separator
US2355057A (en) * 1941-07-18 1944-08-08 Du Pont Apparatus for deaerating viscose compositions

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1182382B (de) * 1958-12-23 1964-11-26 Standard Messo Duisburg Vorrichtung zum Entlueften und Kuehlen von Viskose unter Anwendung von Vakuum-verdampfung
US3229445A (en) * 1961-06-21 1966-01-18 Automatic Process Control Inc Method and apparatus for continuously degassing a liquid
US3793805A (en) * 1971-12-13 1974-02-26 Eastman Kodak Co Method and apparatus for removing air from a liquid
US11550342B2 (en) * 2016-09-09 2023-01-10 Endress+Hauser Flowtec Ag Gas separator and apparatus for measuring flow of one or more components of a multiphase medium, especially a natural gas-water mixture
CN116196657A (zh) * 2021-11-30 2023-06-02 内蒙古伊利实业集团股份有限公司 用于消除涂挂酱料中的气泡的装置和方法
CN116196657B (zh) * 2021-11-30 2024-05-28 内蒙古伊利实业集团股份有限公司 用于消除涂挂酱料中的气泡的装置和方法
CN115522265A (zh) * 2022-05-24 2022-12-27 崔文斌 一种化纤布制造用化纤丝预处理设备

Also Published As

Publication number Publication date
BE522463A (en))
GB759169A (en) 1956-10-17
NL77351C (en))
NL175919B (nl)
DE1089113B (de) 1960-09-15

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