US1571271A - Means for producing acid liquor in sulphite pulp processes - Google Patents

Description

Feb. 2 1926. 157L271 J. DMJENSSEN MEANS FOR PRODUCING ACID LIQUOR IN SULPHITE PULP PROQBSSES Filed Feb. 24', 1925 omssnck MIXING- I llyveryfor. l M j I w Patented Feb. 2, 1926.

UNITED. stares iPA't'hlhlT @FHQEQ moon m nus Jnnssnu, or NEW Yosn N. Y., ASSIGNOB To a. n. JENSSENCOMPANY,

or NEW YORK, n. Y.

MEANS-FOR PRODUCING ACID LIQUOR IN SULPHITE PULP rnocnssns.

Application'filed February 24, 1925.

To all who m it may concern.

Be it known that 1, JACOB Danun Junssnn,

nate thenecessity of heating the water used in the production of the acid liquor during :the colder months of the year, when the temperature of the water is so low as to materially retard the reaction incidental to the making of the liquor :to utilize the waste heat generated in the operation ofcooking innthe sulphite pulp process and distribute [the same tout-he best advantage; to effect economy in the consumption of fuel as well as labor attention and maintenance required in heating the water for the acid liquor tanks: to increase the ellicicncy ofthc sulphite i pulp processes by improving the quality of the liquor used: and generally to provide inthe pulp industry a reduced cost of producticnand a uniform qualit of the outputpand' it consists essentially of any 'lllGfillS employed for-the transference of the relief from a pulp digester to the towers.

acid liquor The drawingis a diagrammatic view showing the towers and receptacles insection'.

, Itis well known i-sulphite made fI'O11'1- SO gases, water-and limestone.

Theusual process is carried out in towers containing; broken limestone through which water tricklesabsorblng the E50 gases rising from the bottom and collecting and absorbing a line base which is commonly The water to effectively permit the reaction must not be chilled: else the combining of the elements is so slow as to effect the quality of the liquor, therefore it is customary in approximately seven months of the year to heat the water used.

The heating of the water specially for the acid liquor process is an additional step as well as a considerable drain on, the hog Serial No. 11,338.

water resources and besides there is alack of uniformity in the temperatures that is not by any means conducive to the best results. a

The present invention utilizes the heat from the digrester 10 in bringing the 'temperature of the -*alcr in the acid liquor up to the desired degree of heat.

The relief pipe 11 from the exhaust outlot 12 of the digester 10 leads to the rcclaiming tank. 1? and extends downvmrdly thercinto and communicates with and sup ports the distributing; nozzle l t having many jet orifices 15 and adapted to distribute the acid'laden fluid in said tank. A cooler 16 connected by the pipes. 1? and 18' with the pipe 11 intermediate of its length for use, when it is desirable in warmer Weather to cool the reclaimed acid liquor and for this purpose the valve 19 is introduced in the pipe line 11 between the connections to the pipes 17 and 18, therefore when the valve 19 is turned to the open position, the cooler is cut out from the operation and its own connection is cut off by the valves 2(land in the pipes 17 andj18; 1 a i The acid liquor making towers 22 andQi-i are respectively the primarvand secondary towers known in the trade as weak, and

strong towers and the acid liquoris made in these towers its-generally described herenr before by the process well known in the art, though for the purpose of clearly explaining this invention a one way system is shown,

whereas the towers are generally reversible, but this does not alter the main feature of that theacid liquor used forudigestingvpurposes is an acid solution "10f calciummagnesium:

the leadcoolers of the sulphur burning plant and enters the tower 22' and 24 and trickles down through the limestone therein gatherin; the from the sulphur burning plant pressedinto the tower by a fan.

The acid liquor resulting from flows from the outlet 25 at the lower end of the tower 22 into the pipe 26, which leads to the mixing box 27.

This mixing the reclaiming tank 13 by the pipe 28, therefore the warm acid liquor flows through the pipe 28 and mixes with the cold acidpliquo r flowing into said box 27 through the pipe 2.

The inlet of the pump 29 is connected to the outlet 30 of the mixing box 27 by the this step box 27 is also connected to pipe 3t and the outlet of the pump is connected by the pipe 32 to the upper end of the tower 23 and this pump 29 forces the moderated mixtures from the mixing box 27 into said tower 23 to trickle down through the limestone and gather the gases rising from the inlet 33 which is connected to the sulphur burning plant. The exhaust gas from the tower 23 is conveyed through the pipe 3% from the upper end ofsaid tower "23-t-o the lower end of the tower 22 for absorption into the fresh water.

The pump ,5 is connected to the lower end of the tower 23 by the pipe 36 and to the reclaiming tank 13 by the pipe 37 and the liquor forced thereby from the tower 23 into the reclainiingtank 13, to be strengthened by the relief gases from the digester 10, asiouly a comparatively small portion of tle contents of said tank 13 is used for warming the acid liquor in process of the making.

The finisher. acid liquor is drawn oil from the reclaiming to the storage tank 38 or distributed direct to the digesters as found convenient and desirable.

It will now be seen that by the diversion of the weak acid liquor from its tower to the mixing chamber before reaching the finished tower the temperature of the liquor is moderated, consequently the liquor trickling through the limestone of the second tower readily gathers the lime base and quick reaction occurs due to the moderate tempera tures whereby the process is not retarded. In place or thisdiappening the temperature of the weakliquor is so regulated that the absorption and chemical union is encoura 'ed and an atlinity established such as would occur under natural conditions during warmer weather conditions when the elements of nature unite under more or less even. tempe atures.

hat I claim is:

l. A means for producing acid liquor in sulphite pulp processes comprising a primary tower for the preliminary step and secondary tower for further treatment, and

a mixer for heating the liquor in passage from tic primary tower to the secondary for the aforesaidfurther treatment.

2. In means for producing acid liquor in sulphite pulp processes, weak and strong liquor towers, a digester, a reclaiming tank connected to the exhaust from said digester, a mixing box forming an intermediary member between said weak liquor tower-and said reclaiming tank on the one hand and said strong liquor tower and said reclaiming tank on the other hand, means for forcing the heated mixture from said mixing box to said strong liquor tower, and means for drawing the liquor from said strong liquor tower to said reclaiming tank.

3. In means for producing acid liquor in sulphite pulp processes, weak and strong liquor towers,a digester having an exhaust pipe extending from the upper end thereof, a cooling box forming a bypass in said'exhaust pipe under suitable valve control, a reclaiming tank connected to the exhaust from said digester, a mixing box forming an intermediary member between saidweak liquor tower and said reclaiming tank on the one hand and said strong liquor tower and said reclaii'ning tank on the other hand, means for forcing the heated mixture from said mixing box to said strong liquor tower, and means for drawing the liquor from said strong liquor tower to said reclaiming tank.

4. In means for producing acid liquor in sulphite pulp processes, a primary producer, an intermediary mixing chamber receiving the discharge from said primary producer, a secondary producer receiving the discharge fromsaid intermediary chamber, a reclaiming tank feeding said intermediary chamber and receiving the discharge from said sec ondary producer and a digester exhausting into said reclaiming tank.

In means for producing acid liquor in sulphite pulp processes, a weak acid tower and a strong acid tower, said strong acid tower having an exhaust gas connection leading to the lower end of said weak acid tower, an intermediary member forming the liquor connection between said towers, a digester and intercommunircvating means furnishing the heatt'rom the exhaust of the digester to said intermediary member.

6. In means for producing acid liquor in sulphite pulp processes, a weak acid tower and a strong acid tower having a gas connection, a digester, a tank common to the exhaust of said dig-ester and the discharge of said strong tower, and means connecting said common tank and said weak tower in cluding mixing chamber.

Signed at New York, N. Y., U. A., this 13th day of January 1925.

JACOB DARRE JENSSEN.

ill)

Images