Can be liquid. Acquire a spectrum for confirmation.

Many thanks Dr. Kaufman for you answer, i will try to perform spectral analysis 

Even I am preparing Schiff's base but is it possible to separate it for analysis ??

but Schiff's bases are sensitive to water if I add MeOH/H2O, water will shift my reaction back...

For alternative preparation see article below:

https://www.researchgate.net/publication/265959505_Synergism_of_Metal_and_Organocatalysis_in_Condensation_Reactions_of_Aromatic_Aldehydes_with_Anilines_Affording_Imines_Effect_of_Catalysts_on_the_Base_of_a_Supported_Cerium%28III%29_and_Proline

Article Synergism of Metal and Organocatalysis in Condensation React...

Gouda, 

This reaction has been reported using toluene as a solvent and

1- AcOH and heat for 3 hrs, see

--- Srinivas, A. et al, Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 47B(5), 787-791; 2008.

2- p-MeC6H4SO3H (cat.), see

--- Kitagawa, Yukio Jpn. Kokai Tokkyo Koho, 08151352, 11 Jun 1996.

--- Rubio-Marques, Paula et al, Chemical Communications (Cambridge, United Kingdom), 50(14), 1645-1647; 2014.

---  Barluenga, Jose et al, Journal of the American Chemical Society, 131(11), 4031-4041; 2009

Also, this reaction was reported using CH2Cl2 (solvent) and MgSO4 for 18 hr at rt, see

---  He, Ruoyu et al, Journal of the American Chemical Society, 136(18), 6558-6561; 2014.

Good luck

Many thanks for you all, Prof. Dr. Adel Amer, Dr. Pavel Pazdera and Dr Azeem