1. A method for recovering caprolactam from a rearrangement mixture of cyclohexanone oxime and sulfuric acid, comprising the steps of:
(a) neutralizing the rearrangement mixture with a base in a neutralization device to obtain a first crude lactam solution containing impurities above a standard value and a second crude lactam solution containing impurities below the standard value;
(b) feeding the first crude lactam solution into a temporary storage device, and feeding the second crude lactam solution into a buffering device;
(c1) feeding a first organic solvent and the first crude lactam solution in the temporary storage device into a temporary extraction device, allowing the first crude lactam solution to be in contact with the first organic solvent to perform batch extraction, so as to obtain a first lactam solution and a first impurity containing a minor amount of organic solvents;
(c2) feeding a second organic solvent and one of the second crude lactam solution in the buffering device and a combination of the second crude lactam solution and the first lactam solution continuously into an extraction device to perform continuous extraction, so as to obtain a second lactam solution and a second impurity containing a minor amount of organic solvents; and
(d) recovering caprolactam from the second lactam solution after the continuous extraction.
2. The method according to claim 1, wherein the step (d) further comprises a step of:
recovering caprolactam from the first lactam solution after the batch extraction, if the second organic solvent and the second crude lactam solution in the buffering device are continuously fed into the extraction device to perform the continuous extraction.
3. The method according to claim 2, wherein the first lactam solution is mixed with the second lactam solution in a ratio of 0.005:1 to 0.1:1 by volume, and the caprolactam is recovered.
4. The method according to claim 1, wherein the base is ammonium hydroxide.
5. The method according to claim 1, wherein the second crude lactam solution contains impurities below 500 ppm.
6. The method according to claim 1, wherein the second crude lactam solution contains impurities below 200 ppm.
7. The method according to claim 1, wherein the batch extraction is repeated one to three times.
8. The method according to claim 1, wherein the first organic solvent and the first crude lactam solution are mixed in a ratio of 1:1 to 3:1 by volume.
9. The method according to claim 1, wherein the first organic solvent and the second organic solvent are independently selected from the group consisting of aromatic hydrocarbons, hydrocarbons substituted with halogen atoms, and linear or cyclic aliphatic alcohols with 4 to 10 carbon atoms.
10. The method according to claim 1, wherein the first organic solvent and the second organic solvent are the same.
11. The method according to claim 1, wherein the first organic solvent and the second organic solvent are both benzene.
12. The method according to claim 1, wherein the second lactam solution contains 15 to 30 wt % caprolactam.
13. The method according to claim 1, wherein the first lactam solution contains 2 to 25 wt % caprolactam.
14. The method according to claim 1, further comprising a step of stripping by steaming the first impurity fed from the temporary extraction device and the second impurity fed from the extraction device.
15. The method according to claim 1, wherein after the first crude lactam solution is extracted with the first organic solvent, the first crude lactam solution stands to separate out a mixture containing sulfates and a minor amount of lactam.
16. The method according to claim 15, wherein the mixture is fed into the neutralization device again to repeat the neutralization of step (a).
17. The method according to claim 1, wherein step (a) further comprises a step of detecting the amounts of the impurities of the first and second crude lactam solutions.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A medical device for treatment of a disease comprising:
a non-invasive brain stimulator operative to selectively stimulate at least one region of a brain of a patient, which at least one region is associated with said disease; and
a cognitive stimulator operative to stimulate at least one cognitive feature in said patient, which said at least one cognitive feature is associated with said disease.
2. A medical device according to claim 1 and wherein said medical device also comprises an analyzer operative to modulate operation of said medical device based at least in part on comparison of a measurement of a property in a patient to a norm of said property, which property is one of the following items: a localized brain feature and a cognitive feature.
3. A medical device according to claim 1 and wherein said medical device also comprises a feedback modulator operative to modulate operation of said medical device based at least in part on detection and analysis of alteration of a property following operation of said medical device, which property is one of the following items: a localized brain feature and a cognitive feature.
4. A method of therapy for a disease, the method comprising:
stimulating at least one region of a brain of a patient, which at least one region is associated with said disease; and
stimulating at least one cognitive feature in said patient, which said at least one cognitive feature is associated with said disease.
5. A method of therapy for a disease according to claim 4 and wherein said method also comprises:
comparing a measurement of a property in property in a patient to a norm of said property, which property is one of the following items: a localized brain feature and a cognitive feature;
and wherein said comparing modulates at least one of the following: said stimulating at least one region of a brain of a patient and said stimulating at least one cognitive feature in said patient.
6. A method of therapy for a disease according to claim 4 and wherein said method also comprises:
analyzing alteration of a property following operation of said medical device, which property is one of the following items: a localized brain feature and a cognitive feature;
and wherein said analyzing modulates at least one of the following: said stimulating at least one region of a brain of a patient and said stimulating at least one cognitive feature in said patient.
7. A medical device for treatment of a disease comprising an electromagnetic stimulator and a laser stimulator and operative to induce a magnetic photo-electric stimulation which selectively stimulates at least one region of a brain of a patient, which at least one region is associated with said disease.
8. A method of therapy for a disease, the method comprising:
electromagnetically stimulating at least one region of a brain of a patient, which at least one region is associated with said disease; and
laser stimulating said at least one region of a brain of a patient by means of at least one laser beam;
and wherein said electromagnetically stimulating and said laser stimulating cause a magnetic photo-electric stimulation.
9. A medical device for treatment of a disease comprising:
a first stimulus generator, operative to induce selective stimulation of a first region of a brain of a patient; and
a second stimulus generator, operative to induce selective stimulation of a second region of said brain of said patient, which second region of said brain of said patient is different from said first region of said brain of said patient;
and wherein a third region of said brain of said patient is comprised in said first region of said brain of said patient and in said first region of said brain of said patient, and is associated with said disease.
10. A method of therapy for a disease, the method comprising:
stimulating a first region of a brain of a patient by means of a first stimulus generator;
stimulating a second region of said brain of said patient, which second region of said brain of said patient is different from said first region of said brain of said patient, by means of a second stimulus generator;
and wherein a third region of said brain of said patient is comprised in said first region of said brain of said patient and in said first region of said brain of said patient, and is associated with said disease.